问题：

[单选] 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.