フリー問題

問題文

An administrator has written three symptom definitions for a storage problem but no alert has ever appeared. What else does an alert definition need?

選択肢

1. The symptoms have to be based on metrics rather than on properties, because only a numeric condition can be compared with the data of a collection.
2. The symptoms have to be attached to a custom group, because the scope of a symptom comes from the membership of the group that it has been added to.
3. The symptoms have to be added to an alert definition together with a recommendation, because a symptom on its own raises nothing of any kind.
4. The symptoms have to be given a criticality of critical or immediate, because a symptom with a lower severity is recorded but is not allowed to raise anything.