What Is the Disadvantage of Setting Up a Site-To-Site VPN

Multiple Choice

What is the disadvantage of setting up a site-to-site VPN in a clustered-units environment?

A) VPN connections can be re-established only if the failed master unit recovers.
B) Smart License is required to maintain VPN connections simultaneously across all cluster units.
C) VPN connections must be re-established when a new master unit is elected.
D) Only established VPN connections are maintained when a new master unit is elected.