I'm wondering about that as well. Maybe they recommend questions that a lot of users commonly get incorrect.

im cooked chat

Necessary = a portal that must be open, but doesn't guarantee arrival.

• It’s like a required checkpoint — if it’s closed, you can’t go through.

• Must be true for the argument to work at all.

Sufficient = a specific path that directly drops you at the goal.

• It’s like stepping on a teleportation pad that guarantees you arrive at the conclusion.

• Proves the conclusion is true.