The correct answer is A. 16.
The Source Port Number in a TCP Header packet is a 16-bit field, which means it is 16 bits long. This field identifies the port number on the source device that is used to initiate the TCP connection.
Here's a brief overview of the other options:
B. 32 bits is the length of the Sequence Number and Acknowledgment Number fields in the TCP Header.
C. 48 bits is not a standard field length in the TCP Header.
D. 64 bits is the length of the Timestamps option in the TCP Header, which is optional and not related to the Source Port Number.
The TCP Header format is defined in RFC 793, and the Source Port Number is specified as a 16-bit field in Section 3.1 of that document.
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