The correct answer is option B. Third party cookies are used by advertising companies to keep track of your web activity as you move from one site to the next.
Cookies that are placed by a website other than the one you are presently on are known as third-party cookies. A "Like" button on your website, for instance, can leave a cookie on a visitor's computer that Face book can later access to recognize them and learn which websites they visited. A cookie of this type is referred to as a third party cookie.
The four primary duties of the majority of advertising companies historically have been client servicing, media planning and buying, creativity, and account planning.
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