Complete the cybersecurity expert's confident prediction about the system recovery.

As long as the mainframe's processing power remains stable, the corrupted data ________ fully restored by the time the CEO arrives tomorrow morning.

The correct answer is will have been.

We use the future perfect passive (will have been + past participle) to describe an action that will be completed before a specific point in the future (indicated here by the phrase "by the time the CEO arrives tomorrow morning").

"Would have been" is incorrect because the condition is in the present tense ("remains"), not a past hypothetical. "Had been" is past perfect and contradicts the future timeframe, while "is being" refers to an action happening right now.