Both Are Acceptable
If someone answers “yes” to a multiple-choice question, then you know they couldn’t care less about giving the right answer or they find all choices equally acceptable. Well, except for the professor, who answered “yes” to one of the two questions posed to them.
In this case, how would a snake wield a knife? Would it grab the handle with its mouth or with the end of its tail? We think snakes are dangerous enough without knives, so we would hate to learn the truth. Thank goodness we’ve never encountered a snake in a dark alley and found out how it holds a blade.