Router R3 receives an LSA with the sequence number 111 from router R4 and then receives another copy of the LSA with a sequence number 112 from router R2. What does router R3 do with the LSA from R2?

A. R3 discards the LSA received from R2 and sends a copy of the LSA from its link state base to R2.
B. R3 installs the LSA received from R2 in its link state database and floods a copy to its neighbors.
C. R3 discards the LSA received from R2 and sends an ACK to R2.
D. R3 installs the LSA received R2 in its link state database, sends an ACK to R2, and floods a copy to its neighbors.

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