When router R1 is the PLR, which router becomes the Merge Point (MP) for this LSP?

Click on the exhibit.

Two LSPs traverse the path R1-R2-R3. Both LSPs are configured with facility fast reroute and link protection.

When router R1 is the PLR, which router becomes the Merge Point (MP) for this LSP?
A . Router R1
B . Router R2
C . Router R3
D . Router R4
E . Router R5

Answer: B