A security engineer is working with a development team to design a supply chain application that stores sensitive inventory data in an Amazon S3 bucket. The application will use an AWS Key Management Service (AWS KMS) customer managed key to encrypt the data in Amazon S3.
The inventory data in Amazon S3 will be shared with hundreds of vendors. All vendors will use AWS principals from their own AWS accounts to access the data in Amazon S3. The vendor list might change weekly.
The security engineer needs to find a solution that supports cross-account access.
Which solution is the MOST operationally efficient way to manage access control for the customer managed key?
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