Which of the following statement defines task definition?

Answer options:

A.JSON template that describes containers which forms your application.
B.Template for a program that runs inside AWS ECS Cluster.
C.AWS managed service that launches ECS clusters.
D.Template that defines actions for each IAM user on the ECS cluster and its containers.

Answer: A
For more information on how to create task definitions, refer documentation here.
https://docs.aws.amazon.com/AmazonECS/latest/developerguide/task_definitions.html