How would you adjust the design to improve convergence on the network?

Refer to the exhibit.

How would you adjust the design to improve convergence on the network?
A . Add an intra-POP link between routers 1A and 1B, and enable IP LFA FR
C . Use an IP SLA between the end stations to detect path failures.
D . Enable SSO-NSF on routers 1A and 1
F . Use BGP to connect the sites over the WA

Answer: A