What is the port number of the IPsec Authentication Header packet？（）

A.the protocol used to determine the authentication method
B.the protocol used to identify the data in the Information field
C.the protocol used to carry the PPP frame
D.the protocol used to decode the FCS field
E.the protocol used to detect the number of padding bytes

A.TCP port
B.authentication
C.IP DF bit
D.retransmit retries
E.sequencing
F.hostname

A.cluster ID
B.Weight
C.MED
D.local preference
E.aggregate