フリー問題

問題文

A service asks for a password and then for a code shown by an application on the phone. A user asks whether that pairing really counts as two factors. Which explanation is correct?

選択肢

1. The pairing counts since the two proofs come from separate categories namely something the user knows and something the user holds while two passwords would both sit in the knowledge category and would add little.
2. The pairing counts since the two proofs come from equal categories namely something the user owns and something the user holds while two passwords would both sit in the ownership category and would add strength.
3. The pairing counts since the two proofs come from separate categories namely something the user knows and something the user holds while two passwords would both sit in the ownership category and would add strength.
4. The pairing counts since the two proofs come from equal categories namely something the user owns and something the user holds while two passwords would both sit in the knowledge category and would add little.