Answer:
d) He can use brand-specific search terms.
Step-by-step explanation:
Search campaigns and all search engines work based on of keywords. Search engines generate results with adequate and relevant keyword input.
So, if Bill wants his Search campaign to be the most effective, he has to strategically pick the keywords that will result in his brand showing up in the Google search results. This concept is related to SEO (search engine optimization), with the whole discipline working with the adequate choice of keywords that result in more customer searches.