Refer to the exhibit. What three statements are true about the IS - IS configuration?（）

• A、The router is in area 49.0001.0002
• B、The router acts as a Level 1 - 2 router
• C、CLNS routing is enable d for the router
• D、The router has a system ID of 0003.0004
• E、The interfaces have a functional IS - IS configuration
• F、The network service access point selector (NSEL) byte has a value of 0