Final answer:
The most commonly used CAC-A electrode for manual cutting or gouging is the copper-coated electrode, preferred for its improved electrical conductivity and durability.
Step-by-step explanation:
The most common style of CAC-A electrode used for Manual cutting or gouging is the B. Copper-coated electrode. Carbon Arc Cutting (CAC-A), also known as air carbon arc cutting or gouging, is a process primarily used in metal fabrication where a carbon electrode is utilized to melt the material, while a blast of air blows the molten metal away, creating a cut or a gouge. The carbon electrode used in this process is generally copper-coated to enhance its electrical conductivity and its durability. Copper coating also helps in stabilizing the arc and it reduces the amount of carbon contamination introduced to the metal being cut.