Final answer:
The CSA W47.1 document has been officially adopted as the source for standard terms and definitions in welding and joining.
Step-by-step explanation:
The correct answer to this question is b. CSA W47.1. The CSA W47.1 document has been officially adopted by the standards writing bodies of Canada as the source for standard terms and definitions in welding and joining. It provides guidelines and requirements for the qualification of welders and welding procedures.