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Tommy has written an AWS Lambda function that will perform certain tasks for the organization when data has been uploaded to an S3 bucket. Security policies for the organization do not allow Tommy to hardcode any type of credential within the Lambda code or environment variables. However, Tommy needs to retrieve a credential from Vault to write data to an on-premises database. What auth method should Tommy use in Vault to meet the requirements while not violating security policies?
Correct Answer: A
Comprehensive and Detailed in Depth Explanation: * A:AWS auth uses IAM roles, avoiding hardcoded credentials. Correct for Lambda. * B:Userpass requires username/password, violating policy. Incorrect. * C:Token requires a pre-generated token, often hardcoded. Incorrect. * D:AppRole needs RoleID/SecretID, typically hardcoded. Incorrect. Overall Explanation from Vault Docs: "The AWS auth method provides an automated mechanism to retrieve a Vault token for IAM principals... no manual credential provisioning required." Reference:https://developer.hashicorp.com/vault/docs/auth/aws#aws-auth-method