The drag, d, on a washer-shaped plate placed normal to a stream of fluid can be expressed as D = f(d1, d2, V, μ, ρ) where d1 is the outer diameter, d2 the inner diameter, V the fluid velocity, µ the fluid viscosity, and ρ the fluid density. Some experiments are to be performed in a wind tunnel to determine the drag. What dimensionless parameters would you use to organize these data?