The five major stages of the consumer buying decision process, in order, are

a$.$ problem recognition, information search, evaluation of alternatives, purchase, and postpurchase evaluation.

b$.$ information search, establishment of product criteria, evaluation of alternatives, purchase, and postpurchase evaluation.

c$.$ information search, evaluation of alternatives, purchase, trial adoption period, and postpurchase evaluation.

d$.$ problem recognition, purchase, evaluation of alternatives, postpurchase evaluation, and rebuy.

e$.$ problem recognition, information search, evaluation of alternatives, postpurchase evaluation, and purchase.