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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 serialize_for_transport(obj_pyxb, pretty=False, strip_prolog=False, xslt_url=None):
 """Serialize PyXB object to XML ``bytes`` with UTF-8 encoding for transport over the network, filesystem storage and other machine usage. Args: obj_pyxb: PyXB object PyXB object to serialize. pretty: bool True: Use pretty print formatting for human readability. strip_prolog: True: remove any XML prolog (e.g., ``<?xml version="1.0" encoding="utf-8"?>``), from the resulting XML doc. xslt_url: str If specified, add a processing instruction to the XML doc that specifies the download location for an XSLT stylesheet. Returns: bytes: UTF-8 encoded XML document See Also: ``serialize_for_display()`` """

    return serialize_gen(obj_pyxb, 'utf-8', pretty, strip_prolog, xslt_url)