Which type of failure is indicated?

Refer to the exhibits.
Exhibit 1

Exhibit 2

Exhibit 1 shows the topology for the network. The network administrator sees the log entries shown in Exhibit 2. Which type of failure is indicated?
A. A link between Switch-1 and Switch-2 went down. BFD detected the lost connectivity and behaved as expected.
B. Graceful restart helper was not enabled on Switvh-2, so BFD was unable to operate correctly, and the session was taken down.
C. A hardware issue caused a unidirectional link; BFD detected the issue at Layer 2 and prevented a broadcast storm.
D. BFD was set up incorrectly on Switch-2, so it caused Switch-2 to lose adjacency with Switch-1 rather than repair the session.

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