Which of the following must be done to properly conduct testing of the data backup portion of a disaster recovery plan?

Performing an integrity test of backup media only verifies the physical or logical health of the media, not the actual recoverability or usability of the data.

Verifying that data on backup media can be read only confirms accessibility, not whether the data is consistent, complete, or can be successfully restored and function in an operational system.

Verifying backup logs confirms that the backup job itself reported success, but it does not confirm the actual integrity or recoverability of the data stored within the backup.

The most comprehensive and effective way to test the data backup portion of a disaster recovery plan is to restore backed-up data to a test server or environment. This process verifies not only the integrity of the backup media but also the ability to successfully recover and make the data usable, validating the entire restore process.