Refer to the exhibit. Which statement is true regarding the topology?（）

• A、An IPSec tunnel cannot be established between Router A and Router B
• B、The Linksys Firewall router does not support PPPoE
• C、Destination addresses defined in RFC 1918 are not supported within an IPSec tunnel
• D、The phone and PC behind Router A will not be able to connect to a host on 192.168.1.0/24