Someone tells you the consensus protocol discussed in lecture for synchronous systems is wrong because we do not know $f($i$.$e$.,$ the number of failures in a group of processes$).$ Your response is: $(1$ point$)$

Yes, the algorithm discussed in lecture is incorrect if we don't know $f.$

$f$ is irrelevant to the discussed consensus algorithm.

You can always set $f=1,$ and the discussed algorithm would then be correct for synchronous systems.

You can always set $f=N,$ and the discussed algorithm would then be correct for synchronous systems.