Anchor bolts holding sills to foundations:

Anchor bolts are crucial components in securing sill plates to concrete foundations, ensuring the stability and integrity of the structure. They provide resistance to lateral forces such as wind and seismic activity. The requirement for nuts and washers is important because they help create a tight connection between the sill plate and the anchor bolt.

Using nuts allows for the bolt to be securely tightened, preventing any movement over time that can lead to structural issues. Washers are also used to distribute the load of the nut over a larger area of the sill plate, which minimizes the risk of crushing the wood and ensures a more secure and lasting connection. This combination of nuts and washers is critical for maintaining the overall safety and durability of the building structure.

The other choices refer to specific practices or standards regarding anchor bolts that may not be universally applicable. However, the requirement for nuts and washers is a standard practice in construction to ensure safety and adherence to building codes.