Which two responses are examples of client error responses in SIP protocol? (Choose two.)

Which two responses are examples of client error responses in SIP protocol? (Choose two.)
A . 302 Moved Temporarily
B . 404 Not Found
C . 503 Service Unavailable
D . 502 Bad Gateway
E . 604 Does Not Exist Anywhere
F . 408 Request Timeout

Answer: B, F

Explanation:

Client Error (400 to 499)―Request contains bad syntax or cannot be fulfilled at this server. This class of 400 to 499 contains only error messages.