You try to perform a traceroute to an Internet destination from your PC, but the traceroute hangs when it reaches the router. There is an inbound access-list applied to the serial interface on the Internet router with a single line: "rule 5 permit tcp source any destination any."
What access-list entry may need to be added to the access-list in order to get traceroute to work?
A . rule 10 permit udp source any destination any
B . rule 10 permit icmp source any destination any icmp-type ttl-exceeded
rule 15 permit icmp source any destination any icmp-type port-unreachable
C . rule 10 permit icmp source any destination any icmp-type ttl-exceeded
rule 15 permit icmp source any destination any icmp-type echo-reply
D . rule 10 permit icmp source any destination any icmp-type echo
rule 15 permit icmp source any destination any icmp-type net-unreachable
E . rule 10 permit udp source any destination any
rule 15 permit icmp source any destination any icmp-type protocol-unreachable
Answer: B