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A company with numerous EC2 Linux instances in AWS must remove shared SSH keys post-audit. Which solution ensures secure access with minimal administrative effort?
A
Implement AWS Systems Manager Session Manager for EC2 instance connections.
B
Utilize AWS STS to create one-time SSH keys as needed.
C
Enable bastion host SSH access and restrict other instances to only accept connections from bastions.
D
Employ Amazon Cognito for user authentication and AWS Lambda to produce temporary SSH keys.
