Explanation:
A listener named LISTENER02 will be started. By naming listener you start LISTENER02, not current listener, LISTENER01. Incorrect Answer:
1: This command LISTENER01, not default listener with name LISTENER.
2: Use the SET CURRENT_LISTENER command to set the name of the listener to administer. Subsequent commands that would normally require listener_name can be issued without it.
4: The START command will not fail.
Reference:
OCP Oracle 9i Database: Fundamentals II Exam Guide, Rama Velpuri, p. 61
Chapter 3: Basic Net Server-Side Configuration

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