Which router(s) is/are IS-Type L1/L2 IS-IS router?

Which router(s) is/are IS-Type L1/L2 IS-IS router?

A.
CE5 only

B.
PE6 only

C.
CE5 and PE6 only

D.
PE5 and PE6 only

E.
CE5, PE5 and PE6

Explanation:
#show clns neighbor