You want to listen on a port for some user-defined data stream. Would you use port 80?

No, it is a 'well-defined' or reserved port.

Yes, it is as good as any other port number.

Yes, it is best ot use low numbers for port numbers.

No, it is best to use three or four digit port numbers.

Answer:
No, it is a 'well-defined' or reserved port.

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