Which AWS service is used for continuous integration and continuous deployment (CI/CD)?

Correct answer: AWS CodePipeline

Option A is correct because AWS CodePipeline is a fully managed continuous delivery service that automates the build, test, and deploy phases of a release pipeline, enabling teams to implement CI/CD workflows that release software changes rapidly and reliably. Option B, AWS Config, is a service for recording and evaluating AWS resource configurations and compliance, not for automating code deployments. Option C, Amazon CloudFront, is a content delivery network that caches and serves content at edge locations worldwide, with no CI/CD functionality. Option D, AWS Shield, is a managed DDoS protection service focused on network and application layer threat mitigation, entirely separate from software delivery pipelines.