You are trying to bring up a new Testking location onto your existing frame relay network. The new location is using an Adtran router and you are having difficulties getting the site to connect via frame to your Cisco HQ router. What is the most likely cause of the problem?（）

• A、Mismatched LMI types.
• B、Incompatible encapsulation types.
• C、Mismatching IP addresses.
• D、Incorrect DLCI.
• E、None of the above