Correct answer should be D.
When the LDP session between two directly connected LSRs is protected, a targeted LDP session is built between the two LSRs. When the directly connected link does go down between the two LSRs, the targeted LDP session is kept up as long as an alternative path exists between the two LSRs. The LDP link adjacency is removed when the link goes down, but the targeted adjacency keeps the LDP session up. When the link comes back up, the LSR does not need to re-establish the LDP session; therefore, the convergence is better.
explanation is right, however, there is no difference between D and C and thus either both have to be correct or neither. This is not a multi answer question therefore, it can be neither.... also the question is asking for which is the hold up not active. The only differing session is that of B.
I'm afraid you're probably giving the exam question writer too much credit. This particular exam is absolutely riddled with these kinds of mistakes and ambiguities. .5 in this example has session protection configured but does not have an active session, hence the "N" in the far right-hand column. Either the question is worded wrong or there are indeed two incorrect answers.
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