Members that are toe nailed to the bearing wall must be nailed with?

When members are toe nailed to a bearing wall, the appropriate choice is to use 3-8d nails. Toe nailing involves driving nails at an angle through the end of the member into the framing it is being secured to. The 8d (eight-penny) nail is commonly used in framing applications due to its length and holding strength, and 3 of these nails provide adequate fastening for structural integrity.

Using 8d nails ensures that there is enough penetration into the adjoining members to secure them properly, preventing issues such as joint failure or structural weakness, which could arise with inadequate fastening. The choice of 3 nails also strikes a balance between strength and the risk of splitting the wood, as using excessively long or too many nails could lead to damage.

In contrast, the other options either suggest using nails that are too small to provide sufficient holding power or do not align with typical framing practices. This makes the selection of 3-8d nails the most effective and standard recommendation for toe nailing members to a bearing wall.