Which AWS service should a developer use to obtain temporary security credentials that can be used to make authenticated requests to other AWS services?
AWS Identity and Access Management (IAM)
AWS Key Management Service (KMS)
AWS Security Token Service (STS)
Amazon Cognito
AWS Security Token Service (STS) issues temporary, limited-privilege credentials-an access key ID, secret access key, and session token-that a developer can use to sign requests to AWS APIs. IAM manages users, groups, and roles but relies on STS to generate temporary credentials. Amazon Cognito handles end-user authentication and can broker credentials through STS, yet it is not itself the service that issues them. AWS Key Management Service (KMS) manages encryption keys and does not provide session credentials.
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