Vertical cooperative advertising is usually legal, except when bogus advertising allowances are given in the form of hidden price concessions. Hence, option D is correct.
What is vertical cooperative advertising?
Vertical cooperative advertising is a new form of advertising wherein a local merchant and manufacturer collaborate, where the costs of advertisement are paid by them in a shared proportion.
Moreover, these types of advertisements are legal only when the merchant does not include any hidden costs while advertising the products of manufacturer.
Hence, option D holds true regarding the vertical cooperative advertising.
Learn more about vertical cooperative advertising here:
https://brainly.com/question/13069568
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