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Which AWS service issues temporary, expiring security tokens to assume roles (cross-account, federated, or via web identity)?

AAmazon RDS
BAWS Snowball
CAWS Security Token Service (STS)
DAmazon Route 53
Answer & Solution
Correct answer: C. AWS Security Token Service (STS)
STS is AWS's short-lived-credential issuer (per DOP-C02 §6.1). The others aren't credential services.
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