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You have a legacy application that requires secrets from Vault that must be written to a local configuration file. However, you cannot refactor the application to communicate directly with Vault.What solution should you implement to satisfy the requirements?
Correct Answer: A
Comprehensive and Detailed in Depth Explanation: For a legacy application that cannot communicate directly with Vault but needs secrets in a local configuration file, theVault Agent with templating featureis the best solution. The HashiCorp Vault documentation notes: "Vault Agent can obtain secrets and provide them to applications," and its templating feature "generates dynamic credentials based on predefined templates" and writes them to files. This allows secrets to be automatically fetched and rendered into a configuration file, meeting the requirement without refactoring. Vault Proxy with Auto-Authsimplifies authentication but doesn't inherently write secrets to files.Vault Proxy as an API proxysecures API access but doesn't address file writing.Vault Agent with caching improves performance but doesn't solve the file output need. Thus, A is correct. Reference: HashiCorp Vault Documentation - Vault Agent and Proxy