A developer needs to ensure that the credentials used by a serverless function to connect to a database are stored securely and are not exposed in plain text. What is the recommended method for managing the credentials to maximize security?
Hardcode the credentials directly into the code base that is part of the serverless function.
Encrypt the credentials manually and include them as part of the serverless function's environment variables.
Leverage a secrets manager to handle the credentials and retrieve them dynamically within the serverless function.
Place the encrypted credentials in a cloud storage service bucket and retrieve them via the serverless function.