Which of the listed requirements would be classified as a recoverability non-functional requirement?

Which of the listed requirements would be classified as a recoverability non-functional requirement?
A . The platform must be integrated with existing change control policies.
B . The platform must be able to support a maximum tolerable downtime (MTD) of 30 minutes.
C . Maintenance windows must be scheduled to take place monthly during an established overnight period.
D . The platform must be available 24 hours a day, 7 days a week with the exception of scheduled downtime.

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Answer: A