Which three statements about IS-IS are true?

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.

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