Explanation:
Trial Recovery feature is used to speed up subsequent media recovery actions. It allows the Administrator to determine how many blocks are affected by corruption, mark them as corrupt in memory to allow the test recovery proceed to completion.
Incorrect Answers:
2: It does not write uncorrupted blocks to disk during the test recovery.
3: There is no TEST option in RECOVER command.
Reference:
OCP Oracle9i Database: New Features for Administrators, Daniel Benjamin, p. 186-187
Chapter 3: Manageability Enhancements
Oracle 9i New Features, Robert Freeman, p. 73-86
Chapter 3: New Oracle9i Availability and Recoverability Features

---