Final answer:
A. 10" on-center. The spacing of the nails when fastening 200-A & 200-B metal trim to drywall is 10" on-center.
Step-by-step explanation:
The correct answer is Option A: 10" on-center. When fastening 200-A & 200-B metal trim to drywall, nails should be spaced at 10" on-center. This means that the nails should be placed 10 inches apart from each other, measured from the center of one nail to the center of the next nail.
This spacing helps ensure the trim is securely attached to the drywall, providing stability and preventing warping or sagging. It also allows for efficient installation, reducing the number of nails required.
For example, if you have a 10-foot section of metal trim, you would divide 10 feet (which is equal to 120 inches) by 10 inches to determine the number of nails needed. In this case, you would need 12 nails.