フリー問題

問題文

Which statement about the fields that a data model dataset can offer to Pivot is correct?

選択肢

1. They can include only the fields that are automatically extracted from the events, because a dataset selects from what is already present and has no way to define fields of its own at all.
2. They can include fields added by user-defined extractions, by lookups, and by evaluation expressions, not only automatically extracted ones.
3. They can include only the default fields plus the extracted fields and attribute names that appear in the constraint.
4. They can include any field, but a child dataset cannot use the fields that its parent defined as constraint fields, report columns, or dataset attribute names.