フリー問題

問題文

The firm wants to notice when the same account is used from a machine it has never seen before, without asking members to install anything. Which pairing of measures achieves that?

選択肢

1. The new machine is noticed through the environment characteristics collected passively, and false alarms are held down by the aggregate history the scoring infrastructure keeps for that account.
2. The new machine is noticed through the packaged characteristics collected passively, and false alarms are held down by the aggregate history the scoring infrastructure keeps for that account.
3. The new machine is noticed through the environment characteristics collected passively, and false alarms are held down by the previous history the scoring infrastructure keeps for that account.
4. The new machine is noticed through the packaged characteristics collected passively, and false alarms are held down by the previous history the scoring infrastructure keeps for that account.