单项选择题
A.Rule 10permit tcp source any destination any
B.Rule 10permit icmp source any destination any icmp-typettl-exceeded rule 15 permit icmp source any destination any icmp-typeport-unreachable
C.Rule 10 permit icmp source any destination anyicmp-typettl-exceeded rule 15 permit icmp source any destination any icmp-typeecho-reply
D.Rule 10 permit udp source any destination any rule 15 permit icmp source any destination any icmp-typeprotocol-unreachable