What recovery console command examines a volume for errors and repairs it?

The command that examines a volume for errors and repairs it is indeed the one that stands out for its specific functionality related to disk integrity. This command, known as Chkdsk (short for Check Disk), is designed to diagnose and fix issues associated with file systems and disk storage. When executed, it scans the file system on a specified drive, identifies any corrupted sectors or files, and attempts to repair them, thereby ensuring data integrity and optimal functioning of the operating system.

In the context of the other options, the "Format" command is used to create a new file system on a drive, effectively erasing existing data rather than checking for errors. "Defrag" is related to optimizing storage performance by rearranging fragmented data on the disk to improve access times, but it does not check or repair errors. Lastly, "Verify" is a general term that might refer to checking files or data but lacks the specific focus on examining and repairing disk errors that Chkdsk provides. Thus, Chkdsk is uniquely positioned to address the task of examining and repairing a volume for errors, making it the correct answer.