The following statement about the security confederation SA in IPsec, which is wrong?

The following statement about the security confederation SA in IPsec, which is wrong?
A . The SA is uniquely identified by a triplet that includes the Security Parameter Index (SP), the source IP address and the security protocol number used (AH or ESP).
B . Use display IPsec to view information about encryption algorithms, traffic, and other information used between another IPsec peer.
C . IPsec only supports the use of symmetric encryption algorithms to encrypt data.
D . There must be two-way SA between IPsec peers to establish an IPsec VPN connection.

Answer: A