Final answer:
The best tool to determine how to use an SMAW electrode is the Welding procedure specification (WPS), which provides detailed guidelines for welders.
Step-by-step explanation:
With the number of different SMAW electrodes available, the best tool to determine the most appropriate way to use the electrode you have selected is d) Welding procedure specification. A welding procedure specification (WPS) is a formal written document describing welding procedures, which provides direction to the welder or welding operators for making sound and quality production welds as per the code requirements. The WPS outlines all the necessary parameters such as the electric arc, electrode type, current range, polarity, and other crucial factors involved in SMAW to ensure safety and effectiveness.