Explanation:
CREATE SCRIPT command is used to allow RMAN to store a group of commands in the recovery catalog. Scripts are created in RMAN using the CREATE SCRIPT command. Once created, the script is an object stored in the recovery catalog, and it will be backed up as part of the recovery catalog.
Incorrect Answers:
1: There is no ADD SCRIPT command in RMAN.
3: There is no command CREATE COMMAND in RMAN.
4: There is no ADD BACKUP SCRIPT command in RMAN.
Oracle 8, DBA Certification Exam Guide, Jason S. Couchman, p. 627-628
Chapter 13: Using Recovery Manager for Backups

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