Python
Methods provided by Python for receiving and sending TCP messages.

s.recvfrom(),s.sendto()
Both (A) and (B)
None of the mentioned
s.recv(), s.send()

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Python
What is the use of duck typing?

More restriction on the type values that can be passed to a given method
Less restriction on the type values that can be passed to a given method
No restriction on the type values that can be passed to a given method
Makes the program code smaller

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