Which of the following is a method to prevent Tracert packet attacks?

Which of the following is a method to prevent Tracert packet attacks?
A . Discard IP packets with time offset
B . Discard the detected ICMP messages or UDP messages that have expired, or the destination port is unreachable.
C . Users can configure the maximum length of ICP packets allowed to pass according to actual network needs. When the length of the actual IP packet exceeds this value, the packet will be discarded.
D . Discard ICMP unreachable messages and record attack logs

Answer: B