Which of the following statements are correct?

View the exhibit.

Which of the following statements are correct? (Choose two.)
A . This setup requires at least two firewall policies with the action set to IPsec.
B. Dead peer detection must be disabled to support this type of IPsec setup.
C. The TunnelB route is the primary route for reaching the remote site. The TunnelA route is used only if the TunnelB VPN is down.
D. This is a redundant IPsec setup.

Answer: C,D

Explanation:

https://docs.fortinet.com/document/fortigate/6.2.4/cookbook/632796/ospf-with-ipsec-vpn-for-network-redundancy