Answer: Key pairs

The minimum security credentials required to control AWS services using the AWS CLI are access keys. Access keys consist of an access key ID and a secret access key, which are used to sign programmatic requests made to AWS services. Although IAM users need a password to access the AWS Management Console, they require an access key pair to perform the same operations using the AWS CLI. It is recommended to use IAM users instead of the root user for AWS interactions and to use access keys in conjunction with multi-factor authentication (MFA) for enhanced security. The correct answer is D, 'Key pairs', as it refers to the access key ID and secret access key collectively, which are the actual credentials needed for AWS CLI operations.

Author: LeetQuiz Editorial Team