Which TCP and UDP ports must you filter to check null sessions on your network?

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Null sessions are un-authenticated connections (not using a username or password.) to an NT or 2000 system.

Which TCP and UDP ports must you filter to check null sessions on your network?
A . 137 and 139
B . 137 and 443
C . 139 and 443
D . 139 and 445

Answer: D