Comprehensive and Detailed In-Depth Explanation:
The AWS secrets engine generates dynamic credentials, enhancing security. The Vault documentation states:
"The best bet here is to use the AWS secrets engine to generate dynamic credentials for your AWS account(s) when Terraform is executed. You can use the Vault provider to grab these credentials for Vault and then use the credentials as inputs for your AWS provider. In this scenario, Terraform would generate credentials only when executed, and the credentials would automatically expire when the lease expires."
-Vault Secrets: AWS
* D: Correct. Dynamic, short-lived credentials limit exposure:
"Enabling the aws secrets engine in Vault allows you to dynamically generate short-lived AWS credentials for each terraform apply."
-Vault Secrets: AWS
* A: SSH engine is unrelated to AWS.
* B: Transit encrypts data, not credentials.
* C: KV stores static credentials, less secure.
References:
Vault Secrets: AWS
Vault Provider for Terraform