What will happen to the MPLS data traffic to router R6 IMMEDIATELY after the link goes down?

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An LDP tunnel is established on router R1 towards router R6. The link between routers R2 and R4 goes down .

What will happen to the MPLS data traffic to router R6 IMMEDIATELY after the link goes down?
A . MPLS data traffic will be discarded until the IGP finds a new next-hop to router R3.
B . MPLS data traffic will be discarded unless the LDP tunnel has a standby secondary path.
C . MPLS data traffic will not be discarded because router R1 received labels from both next-hops, routers R2 and R3.
D . MPLS data traffic will not be discarded because of fast reroute capability on router R2.

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Answer: B