To answer this question, you need to understand the roles of various background processes in Oracle database.
Option A) PMON coordinates media recovery - This option is incorrect. PMON (Process Monitor) is responsible for cleaning up the resources of failed or terminated processes. It does not coordinate media recovery.
Option B) SMON coordinates instance recovery - This option is correct. SMON (System Monitor) is responsible for coordinating instance recovery. When an instance aborts or crashes, SMON ensures that the database is recovered to a consistent state when it is brought back up.
Option C) PMON coordinates instance recovery - This option is incorrect. While PMON plays a role in instance recovery by cleaning up failed processes and releasing resources, it does not coordinate the overall instance recovery process.
Option D) Undo Advisor would roll back all uncommitted transactions - This option is unrelated to the situation described in the question. The Undo Advisor is a feature that helps optimize undo retention and undo space allocation.
Option E) SQL*PLUS reports an error with the message asking you to perform instance recovery - This option is incorrect. SQL*Plus is a command-line interface tool for Oracle database, and it does not report any error related to instance recovery. It is the responsibility of the background processes (such as SMON) to coordinate instance recovery.
The correct answer is B) SMON coordinates instance recovery. This option is correct because SMON is responsible for coordinating instance recovery, ensuring that the database is recovered to a consistent state when the instance is brought back up.