Which command can be used to verify the health of the Exchange database?

The chosen command is effective for verifying the health of the Exchange database because it directly requests the status of mailbox database copies in a database availability group (DAG). This command provides insights into whether the active mailbox database copies are functional and whether all passive copies are healthy and synchronized properly. Understanding the status of mailbox database copies is crucial in ensuring that email services remain reliable and that data is consistently available for users.

In contrast, other options do not focus specifically on the health of the Exchange databases. The first choice, while it mentions checking the database health, is not a valid command in Exchange Management Shell and does not outline a specific method for verifying database health. The third option, though important for overall server health, checks the status of Exchange services rather than focusing on database integrity. Lastly, the fourth option suggests an enabling function that is not necessary for simply verifying database health and does not provide direct information about the current status of the databases. Therefore, the correct choice is the one that explicitly queries the health and synchronization status of the mailbox database copies.