フリー問題

問題文

A service sends its one time codes as text messages to a mobile number. Someone persuades the mobile operator to move that number to a different card. What does that transfer mean for the codes?

選択肢

1. The codes then arrive at the mailbox of that person, so a factor delivered to a number depends on the signatures of the operator, while a code produced inside an application on the handset is unaffected because the shared secret never leaves the device.
2. The codes then arrive at the handset of that person, so a factor delivered to a number depends on the procedure of the operator, while a code produced inside an application on the handset is unaffected because the shared label never leaves the panel.
3. The codes then arrive at the mailbox of that person, so a factor delivered to a number depends on the signatures of the operator, while a code produced inside an application on the handset is unaffected because the shared label never leaves the panel.
4. The codes then arrive at the handset of that person, so a factor delivered to a number depends on the procedure of the operator, while a code produced inside an application on the handset is unaffected because the shared secret never leaves the device.