In reference to the P1R3 show isis route output, which statement is true? （）

• A、P1R1 is the exi t point out of the area for P1R3.
• B、P1R1 is a level - 1 only IS - IS router.
• C、P1R1 has been configured with a nondefault IS - IS metric.
• D、P1R3 is a level - 2 only IS - IS router.
• E、P1R3has been configured with a nondefault IS - IS metric.
• F、P1R3 routing ta ble should contain i L2 entries.