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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 disabled(name):
    '''
    Check to see if the named service is disabled to start on boot

    CLI Example:

    .. code-block:: bash

        salt '*' service.disabled <service name>
    '''
    if _service_is_upstart(name):
        return _upstart_is_disabled(name)
    else:
        if _service_is_sysv(name):
            return _sysv_is_disabled(name)
    return None