Before installing exterior walkway anti-slip nosings under a QA spec that requires dimensional sign-off before full install, what is the first documented step called for in keyed site practice?

Choices

• (A) Seal the area without a mock-up drawing
• (B) Field mock-up with measured edge geometry and engineer acceptance per spec
• (C) Swap skid material based on visuals without engineer buy-in
• (D) Defer sign-off indefinitely without acceptance tests