Under which of the following circumstances should you create an Emergency Repair Disk (ERD)? Choose all correct options.

A.
After you initially install the server system.

B.
When you back up files and data.

C.
After you reboot the primary server.

D.
After a driver update has been performed.

Explanation:
Because an ERD is used to restore a server’s configuration, you should create an ERD after you initially install the server system, and after significant system changes have been made. Significant system changes include modifications such as performing driver updates and applying service packs.
Incorrect
Answers:

B:
You do not need to create an ERD whenever you back up files and data. An ERD should be created after significant system changes have been made.
C: There is no need to create an ERD whenever a primary server is rebooted.
References:
Charles J. Brooks, Server+ Certification Exam Cram 2 (Exam SK0-002), QUE Publishing, Indianapolis, 2006, pp. 441.