Which of the following is one of the purposes of the Network Advertising Initiative?

a$.$

To prevent consumers for seeing an ad for a certain product, and then purchasing a rival product afterwards.

b$.$

To allow consumers to completely avoid all online advertisements through mobile platforms.

c$.$

To offer consumers a means by which they can opt out of some advertising campaigns.

d$.$

To allow consumers to completely avoid all online advertisements through mobile platforms and more traditional laptop$/$desktop platforms.