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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def nextCmd(snmpEngine, authData, transportTarget, contextData, *varBinds, **options):
 """Performs SNMP GETNEXT query. Based on passed parameters, prepares SNMP GETNEXT packet (:RFC:`1905#section-4.2.2`) and schedules its transmission by :mod:`twisted` I/O framework at a later point of time. Parameters snmpEngine : :class:`~pysnmp.hlapi.SnmpEngine` Class instance representing SNMP engine. authData : :class:`~pysnmp.hlapi.CommunityData` or :class:`~pysnmp.hlapi.UsmUserData` Class instance representing SNMP credentials. transportTarget : :class:`~pysnmp.hlapi.twisted.UdpTransportTarget` or :class:`~pysnmp.hlapi.twisted.Udp6TransportTarget` Class instance representing transport type along with SNMP peer address. contextData : :class:`~pysnmp.hlapi.ContextData` Class instance representing SNMP ContextEngineId and ContextName values. \*varBinds : :class:`~pysnmp.smi.rfc1902.ObjectType` One or more class instances representing MIB variables to place into SNMP request. Other Parameters \*\*options : Request options: * `lookupMib` - load MIB and resolve response MIB variables at the cost of slightly reduced performance. Default is `True`. * `ignoreNonIncreasingOid` - continue iteration even if response MIB variables (OIDs) are not greater then request MIB variables. Be aware that setting it to `True` may cause infinite loop between SNMP management and agent applications. Default is `False`. Returns ------- deferred : :class:`~twisted.internet.defer.Deferred` Twisted Deferred object representing work-in-progress. User is expected to attach his own `success` and `error` callback functions to the Deferred object though :meth:`~twisted.internet.defer.Deferred.addCallbacks` method. Raises ------ PySnmpError Or its derivative indicating that an error occurred while performing SNMP operation. Notes ----- User `success` callback is called with the following tuple as its first argument: * errorStatus (str) : True value indicates SNMP PDU error. * errorIndex (int) : Non-zero value refers to `varBinds[errorIndex-1]` * varBinds (tuple) : A sequence of sequences (e.g. 2-D array) of :py:class:`~pysnmp.smi.rfc1902.ObjectType` class instances representing a table of MIB variables returned in SNMP response. Inner sequences represent table rows and ordered exactly the same as `varBinds` in request. Response to GETNEXT always contain a single row. User `error` callback is called with `errorIndication` object wrapped in :class:`~twisted.python.failure.Failure` object. Examples -------- (0, 0, [[ObjectType(ObjectIdentity(ObjectName('1.3.6.1.2.1.1.1.0')), DisplayString('SunOS zeus.snmplabs.com 4.1.3_U1 1 sun4m'))]]) """

    def __cbFun(snmpEngine, sendRequestHandle,
                errorIndication, errorStatus, errorIndex,
                varBindTable, cbCtx):

        lookupMib, deferred = cbCtx

        if (options.get('ignoreNonIncreasingOid', False) and errorIndication
                and isinstance(errorIndication, errind.OidNotIncreasing)):
            errorIndication = None

        if errorIndication:
            deferred.errback(Failure(errorIndication))

        else:
            try:
                varBindTable = [
                    VB_PROCESSOR.unmakeVarBinds(snmpEngine.cache,
                                                varBindTableRow, lookupMib)
                    for varBindTableRow in varBindTable
                ]

            except Exception as e:
                deferred.errback(Failure(e))

            else:
                deferred.callback((errorStatus, errorIndex, varBindTable))

    addrName, paramsName = LCD.configure(
        snmpEngine, authData, transportTarget, contextData.contextName)

    varBinds = VB_PROCESSOR.makeVarBinds(snmpEngine.cache, varBinds)

    deferred = Deferred()

    cmdgen.NextCommandGenerator().sendVarBinds(
        snmpEngine, addrName, contextData.contextEngineId,
        contextData.contextName, varBinds, __cbFun,
        (options.get('lookupMib', True), deferred))

    return deferred