In Bonus Pack Pricing Strategy

In bonus pack pricing strategy:

A) lower prices are charged at certain times to encourage customers to come during slack periods.
B) more than one unit of the same product are combined and sold at a low price.
C) products are sold at different price points to attract the low-,mid-,and high-end customers.
D) the base item is sold at a low price and the necessary supplies are sold for a high price.