Which version of the dev build do I play?
Do I get the api.zip?
The dev-deobf thing.jar?
The nothing special.jar?
DAAAAAAAAAAAAAAAAAAAH
##Plain English Translation Below## 
I go over to the Jenkins website and there are 3 files I can download:
The industrialcraft-2-api #.#.###-experimental.zip,
The industrialcraft-2-dev-deobf-#.#.###-experimental.jar,
Or the industrialcraft-2 #.#.###-experimental.jar.
If I want to play the dev build on my client, WHICH FILE SHOULD I GET? 
Please help me. Thank you. 
P.S. 
Wrenches To You