Which three statements about IS-IS are true? (Choose three.)
A.
IS-IS is not encapsulated in IP.
B.
IS-IS is directly encapsulated in the data link layer.
C.
0XFEFE is used in the Layer 2 header to identify the Layer 3 protocol.
D.
IS-IS uses protocol ID 93.
E.
IS-IS can be used to route the IPX protocol.
F.
IS-IS is an IETF standard.