Assuming that the IGP is properly configured, which issue causes a temporary data flow blackholing when the IGP and LDP reconverges?

An engineer is troubleshooting L3VPN traffic loss over the MPLS-enabled core network when new core links were enable.

Assuming that the IGP is properly configured, which issue causes a temporary data flow blackholing when the IGP and LDP reconverges?
A . MPLS-TE tunnels without LDP adjacencies are used over the new links black-holing the traffic before the LDP label exchange is completed
B . MP-BGP sessions between PE and RR routers require extra time to reconverge than the underlying IGP
C . IP packets are forwarded as soon as routes are learned over a new IGP adjancey before the label exchange happens over the new links
D . LDP is a Layer 2 protocol forwarding Label packets before the IGP reconverged

Answer: C