The Cisco IOS XE Software summary-address router IS-IS configuration command can be used to send a summarized route into which IS-IS hierarchy?

The Cisco IOS XE Software summary-address router IS-IS configuration command can be used to send a summarized route into which IS-IS hierarchy?
A . Level 1 only
B . Level 2 only
C . Level-1-2 only
D . Level 1 or Level 2 or Level-1-2

Answer: D

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