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A media company has deployed a multi-tier architecture on AWS. Web servers are deployed in two Availability Zones using an Auto Scaling group with a defaultAuto Scaling termination policy. The web servers' Auto Scaling group currently has 15 instances running.Which instance will be terminated first during a scale-in operation?

• The instance with the oldest launch configuration.

• The instance in the Availability Zone that has most instances.

• The instance closest to the next billing hour.

• The oldest instance in the group.