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You have a video transcoding application running on Amazon EC2. Each instance polls a queue to find out
which video should be transcoded, and then runs a transcoding process. If this process is interrupted, the video
will be transcoded by another instance based on the queuing system. You have a large backlog of videos which
need to be transcoded and would like to reduce this backlog by adding more instances. You will need these
instances only until the backlog is reduced. Which type of Amazon EC2 instances should you use to reduce the
backlog in the most cost efficient way?

A.
Reserved instances

B.
Spot instances

C.
Dedicated instances

D.
On-demand instances

Explanation:
http://aws.amazon.com/ec2/purchasing-options/spot-instances/

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