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A developer at a company uses an SSH key to access multiple Amazon EC2 instances.

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A developer at a company uses an SSH key to access multiple Amazon EC2 instances. The company discovers that the SSH key has been posted on a public GitHub repository. A security engineer verifies that the key has not been used recently.

How should the security engineer prevent unauthorized access to the EC2 instances?

A.

Delete the key pair from the EC2 console. Create a new key pair.

B.

Use the ModifylnstanceAttribute API operation to change the key on any EC2 instance that is using the key.

C.

Restrict SSH access in the security group to only known corporate IP addresses.

D.

Update the key pair in any AMI that is used to launch the EC2 instances. Restart the EC2 instances.

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