An experiment was conducted to determine the durability of three brands of outdoor paints (B1, B2 and B3) and two types of paint additives (A1 and A2). Several identical pieces of wood were painted, so that each combination of band/additive was applied to 12 pieces. All the pieces were then subjected to identical extreme weather conditions, and an expert assigned a durability score to each piece of wood.

(a) What is the number of treatments?

(b) What is the number of replications for each treatment?

(c) What is the experimental unit?

(d) What is the total number of measurements?