An Education Company Has a Docker-Based Application Running on Multiple

Multiple Choice

An education company has a Docker-based application running on multiple Amazon EC2 instances in an Amazon ECS cluster. When deploying a new version of the application, the Developer, pushes a new image to a private Docker container registry, and then stops and starts all tasks to ensure that they all have the latest version of the application. The Developer discovers that new tasks are occasionally running with an old image. How can this issue be prevented?

A) After pushing the new image, restart ECS Agent, and then start the tasks.
B) Use "latest" for the Docker image tag in the task definition.
C) Update the digest on the task definition when pushing the new image.
D) Use Amazon ECR for a Docker container registry.