When a firm has been granted a trademark, which grants legal protection against other firms using the name of the product that has been granted the trademark, the firma) still faces the possibility that the name will become widely used and no longer associated with a specific company. b) does not have to worry about legally enforcing the trademark; this is the responsibility of the legal system. c) still must apply for a copyright and a patent to ensure that no other firm will use the product's name. d) must spend an annual amount on advertising the product each year; the amount it must spend is negotiated by the firm and the government agency that grants the trademark.