Where in the game tree does the alpha and beta cutoffs occur?

Keep in mind that you have to execute the algorithm completely. Study the process of cutoffs carefully. Remember that a cutoff can only be determined after a node was evaluated. This means that all further $($if any$)$ siblings are cut off and not evaluated. That is the purpose of alpha$-$beta pruning.

Select one or more:

Cutoffs occur after nodes K$,$ L and H$.$

Nodes M$,$ I, Q$,$ and R are cut off.

Cutoffs occur after nodes L and H$.$

Nodes M$,$ H$,$ I, P$,$ Q$,$ and R are cut off.

No nodes are cut off in this game tree.