In which scenario should Amazon EC2 Spot Instances be used?

In which scenario should Amazon EC2 Spot Instances be used?
A . A company wants to move its main website to AWS from an on-premises web server.
B . A company has a number of application services whose Service Level Agreement (SLA) requires 99.999% uptime.
C . A company’s heavily used legacy database is currently running on-premises.
D . A company has a number of infrequent, interruptible jobs that are currently using On-Demand Instances.

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Answer: D