How does the GRE keepalive configuration affect tunnel operation on these two routers?

Refer to the exhibit.

How does the GRE keepalive configuration affect tunnel operation on these two routers?
A. R1 will not send keepalives until keepalives are configured on R2
B. R1 will detect tunnel failures within 5 seconds
C. R1 will detect tunnel failures within 20 seconds
D. R1 will send keepalives, but R2 will not return them

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