David Was Able to Connect His Computer to the Internet

Multiple Choice

David was able to connect his computer to the Internet successfully at his place. However, when he tried to connect his computer at his friend's place, it wouldn't connect to the Internet. The Internet connection is working fine since his friend is able to connect to the Internet on the same connection. What should David check for?

A) Check if his friend's connection uses automatic IP addressing or manual IP addressing.
B) Check if he can ping the loopback address.
C) Check the IP address on his computer.
D) Check if he can ping the default gateway.