Which of the following conditions must exist in order for marketing to occur? a$.$A product, a price, a method of promotion, and a way to place the product with the customerb.Two or more people, a method of assessing needs, a way to communicate and an exchangec.Two or more people, a product, a reasonable price and a place to make an exchanged.Two or more parties with unsatisfied needs, a desire and ability to satisfy them, a way to communicate and something to exchangee.Two or more parties with unsatisfied needs, a desire to satisfy them, a satisfactory product and something to exchange