Click the Exhibit button.
You are configuring an IPsec VPN for the network shown in the exhibit.
Which feature must be enabled for the VPN to establish successfully?
A. Main mode must be configured on the IKE gateway.
B. Main mode must be configured on the IPsec VPN.
C. Aggressive mode must be configured on the IPsec VPN.
D. Aggressive mode must be configured on the IKE gateway.