What is the reason for failed VPN connection?

Vanessa is reviewing ike.elg file to troubleshoot failed site-to-site VPN connection After sending Mam Mode Packet 5 the response from the peer is PAYLOAD-MALFORMED"

What is the reason for failed VPN connection?
A . The authentication on Phase 1 is causing the problem. Pre-shared key on local gateway encrypted by the hash algorithm created in Packet 3 and Packet 4 doesn’t match with the hash on the peer gateway generated by encrypting its pre-shared key
B . The authentication on Phase 2 is causing the problem Pre-shared key on local gateway encrypted by the hash algorithm created in Packets 1 and 2 doesn’t match with the hash on the peer gateway generated by encrypting its pre-shared key
C . The authentication on Quick Mode is causing the problem Pre-shared key on local gateway encrypted by the hash algorithm created in Packets 3 and 4 doesn’t match with the hash on the peer gateway generated by encrypting its pre-shared key
D . The authentication on Phase 1 is causing the problem Pre-shared key on local gateway encrypted by the hash algorithm doesn’t match with the hash on the peer gateway generated by encrypting its pre-shared key created in Packet 1 and Packet 2

View Answer

Answer: A