What is a Docker file?
A.
a read only file system with parameters that is referenced at runtime
B.
a document containing required commands to build Docker images
C.
a document that only contains Docker attributes and definitions
D.
a self-contained running instance built from one or more Docker images
Explanation:
https://www.ibm.com/blogs/bluemix/2015/06/ibm-containers-a-bluemix-runtime-leveraging-dockertechnology/