What is the following command trying to accomplish?

What is the following command trying to accomplish?
A . Verify that UDP port 445 is open for the 192.168.0.0 network
B . Verify that TCP port 445 is open for the 192.168.0.0 network
C . Verify that NETBIOS is running for the 192.168.0.0 network
D . Verify that UDP port 445 is closed for the 192.168.0.0 network

Answer: A