To minimize rebound during gunning, API TR 980 clearly instructs to:
"Begin at the lowest level of the installation and build up gradually to full thickness in a small area of approximately 10 ft² (1 m²), avoiding sweeping motions."
- API TR 980, Section 4.3.4
This method prevents rebound contamination and cold joints that could occur if a larger area is covered too quickly or in an uncontrolled pattern.
Therefore, Option C is correct, and Options A, B, and D are incorrect according to best practices outlined in API TR 980.