Which of the following components of AWS Data Pipeline …

Which of the following components of AWS Data Pipeline polls for tasks and then performs those
tasks?

A.
Pipeline Definition

B.
Task Runner

C.
Amazon Elastic MapReduce (EMR)

D.
AWS Direct Connect

Explanation:
Task Runner polls for tasks and then performs those tasks.
http://docs.aws.amazon.com/datapipeline/latest/DeveloperGuide/what-is-datapipeline.html