What command do you use to test a systems IPv4 protocol stack?

What command do you use to test a systems IPv4 protocol stack?

A.
ping 127.0.0.1

B.
ping self

C.
ping 255.255.255.255

D.
ping defaultgateway

Explanation:
Section Reference: Working with Ipconfig and Ping
When you ping 127.0.0.1, the results do not include any hostname resolution information. This is the best way
to ping the local host when testing IPv4. When pinging 127.0.0.1, no traffic is placed on the network segment;
instead, all traffic is kept inside the computer orlocal loopback.