What is an application delivery pipelines?

A.
It is a prescriptive water-STRUM-fall development approach for building applications rapidly.

B.
It is a tool that deploys applications multiply web services.

C.
It is a technique to assemble application web services.

D.
It is an integrated set of tools to define, develop, build and test code, and achieve continuous integration
delivery.

Explanation:
https://console.ng.bluemix.net/docs/services/DeliveryPipeline/about.html