Consider unsteady fully developed Coutte flow-flow between two infinite parallel plates. This problem involves the following parameters: velocity component u, distance between the plates h, vertical distance y, top plate speed V, fluid density ρ, fluid viscosity μ, and time t. The number of expected nondimensional parameters Πs for this problem is

(a) 6 

(b) 5 

(c) 4 

(d) 3 

(e) 2