When consumers agree to buy now and pay later on an installment plan that includes interest, it is called?

1) the stages a new product goes through from beginning to end, i.e., the stages that a product passes through from introduction through growth, maturity, and decline. 2) the time from initial research and development to the time at which sales and support of the product to customers are withdrawn. 3) the period of time during which a product can be produced and marketed profitably.

                                          hope it

a

b

b

a

c

b

d

d

none of these are correct, as they are all sources of american law

a