Explanation:
Workload class in Oracle Expert describes how the database is used in daily operations.
Incorrect Answers:

1: Schema class is used to describe schema structure, not database daily operations usage.
3: Instance class is not used for these purposes.
4: Environment class of Oracle Expert is not used for these purposes.
Oracle 8, DBA Certification Exam Guide, Jason S. Couchman, p. 961-968. Chapter 20: Tuning Other Areas of the Oracle Database

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