Where gypsum board panels meet at outside corners, these corners should be protected with:

• A. corner bead
• B. corner trim
• C. baseboard
• D. metal flashing

Answer: (A)

Gypsum board panels at outside corners must be protected to prevent damage and ensure durability, and using corner bead is the standard practice for this purpose. Corner bead is a rigid strip often made of metal or vinyl, which helps create a straight, clean line at the corners of walls. It provides strength and support to the corners that are often susceptible to impacts and wear over time.

Applying corner bead enhances the finish of the drywall installation, facilitating smoother joint tape application and a more polished look once painted. It is specifically designed for this application, making it ideal for maintaining the integrity of the corner edges against chipping or breaking.

The other options do not serve the same protective and structural role at outside corners of gypsum board panels. For instance, corner trim typically refers to decorative elements that cover gaps or provide aesthetic value rather than structural protection. Baseboards are intended for the junction between the wall and floor, and metal flashing is primarily used in roofing and water management contexts, not specifically for corners of drywall installations.