To ensure a secure and consistent deployment using AWS CloudFormation, it is important to use versioning and enforce security measures such as template hardening and drift detection. This will help to maintain the integrity of the infrastructure and detect any unauthorized changes. Option A does not enforce any security measures, which is not secure. Option B does not enforce security measures, which is not secure. Option D does not use CloudFormation and does not enforce any security measures, which is not a best practice.