A security engineer is checking an AWS CloudFormation template for vulnerabilities.

The correct answer is B. Store the API key value in AWS Secrets Manager. In the template, replace all references to the value with {{resolve:secretsmanager:MySecretId:SecretString}}.

This answer is correct because AWS Secrets Manager is a service that helps you protect secrets that are needed to access your applications, services, and IT resources. You can store and manage secrets such as database credentials, API keys, and other sensitive data in Secrets Manager.You can also use Secrets Manager to rotate, manage, and retrieve your secrets throughout their lifecycle1.Secrets Manager integrates with AWS CloudFormation, which allows you to reference secrets fromyour templates using the {{resolve:secretsmanager:…}} syntax2. This way, you can avoid exposing your secrets in plaintext and still use them in your resources.

The other options are incorrect because:

A. Storing the API key value as a SecureString parameter in AWS Systems Manager Parameter Store is not a solution, because AWS CloudFormation does not support references to SecureString parameters.This means that you cannot use the {{resolve:ssm:…}} syntax to retrieve encrypted parameter values from Parameter Store3. You would have to use a custom resource or a Lambda function to decrypt the parameter value, which adds complexity and overhead to your template.

C. Storing the API key value in Amazon DynamoDB is not a solution, because AWS CloudFormation does not support references to DynamoDB items.This means that you cannot use the {{resolve:dynamodb:…}} syntax to retrieve item values fromDynamoDB tables4. You would have to use a custom resource or a Lambda function to query the DynamoDB table, which adds complexity and overhead to your template.

D. Storing the API key value in a new Amazon S3 bucket is not a solution, because AWS CloudFormation does not support references to S3 objects.This means that you cannot use the {{resolve:s3:…}} syntax to retrieve object values from S3 buckets5. You would have to use a custom resource or a Lambda functionto download the object from S3, which adds complexity and overhead to your template.