In the Radius protocol, there are three responses to the message with CODE=1. Which are the possible response messages except the CODE=3 and CODE=11 packets?

In the Radius protocol, there are three responses to the message with CODE=1. Which are the possible response messages except the CODE=3 and CODE=11 packets?
A . Messages with CODE=2
B . Messages with CODE=4
C . Messages with CODE=5
D . Messages with CODE=10

Answer: A