You are asked to implement an IPsec VPN between your main office and a new remote
office. The remote office receives its IKE gateway address from their ISP dynamically.
Regarding this scenario, which statement is correct?
Configure the dynamic-host-address option as the IKE identity.
Configure the unnumbered option as the IKE identity.
Configure a dynamic host configuration name (DHCN) as the IKE identity.
Configure a fully qualified domain name (FQDN) as the IKE identity.