Tread inc. is the market leader for sports shoes in the subcontinent of gavon. though the brand has not introduced any new product lines over the past decade, its signature products enjoy a high demand and have always remained popular. according to the concept of advertising response function, which of the following should be tread inc.'s advertising strategy? a. its advertisements should easily affect target consumers' deeply rooted values and attitudes. b. it should spend proportionately less on advertising than on a newer line. c. it should penetrate consumers' perceptual defenses and affect purchase intentions. d. it should have a large budget for advertising expenditures.