Which of the following statements is a possible cause for the failure to establish the VPN tunnel?

A FortiClient fails to establish a VPN tunnel with a FortiGate unit.
The following information is displayed in the FortiGate unit logs:

Which of the following statements is a possible cause for the failure to establish the VPN tunnel?
A. An IPSec DHCP server is not enabled on the external interface of the FortiGate unit.
B. There is no IPSec firewall policy configured for the policy-based VPN.
C. There is a mismatch between the FortiGate unit and the FortiClient IP addresses in the phase 2 settings.
D. The phase 1 configuration on the FortiGate unit uses Aggressive mode while FortiClient uses Main mode.

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