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A company has two AWS accounts: A production account and a development account. Developers with user accounts in the production account need to be able to access artifacts stored in an Amazon S3 bucket in the development account when deploying resources. A cross-account role has been created in the development account with access to the S3 bucket. The security team requires that the users can assume the role only if they are authenticated with multi-factor authentication (MFA). Which step should the security engineer take to meet these requirements?