In this network design, where should summarization occur to provide the best summarization and optimal paths during a single-failure incident as well as during normal operation?

Refer to the exhibit.

In this network design, where should summarization occur to provide the best summarization and optimal paths during a single-failure incident as well as during normal operation?
A . a single identical summary for all the branch offices placed on routers 1A, 1B, 2A, and 2B
B . two summaries on 1A and 1B, and two summaries on 2A and 2B
C . a single identical summary on 3A and 3B
D . a single summary on each aggregation device for the branches connected to them

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Answer: C