Which one of the following is true for the calculation of overall market share?

A. (Customer penetration) × (Customer loyalty) × (Price selectivity)

B. (Customer loyalty) × (Customer selectivity) × (Price selectivity)

C. (Customer selectivity) × (Price selectivity) × (Customer penetration)

D. (Customer penetration) × (Customer loyalty) × (Customer selectivity) × (Price selectivity)

Answer: Option D