Point out the correct statement.
(a) Yahoo search is the most popular search engine on the Web
(b) Google Ad Planner is a free media planning tool that can help you identify websites your audience is likely to visit so you can make better-informed advertising decisions
(c) Google AdSense is a free media planning tool that can help you identify websites your audience is likely to visit so you can make better-informed advertising decisions
(d) All of the mentioned
I had been asked this question during an interview.
I'm obligated to ask this question of Google Application Portfolio in section PaaS – Platform as a Service and Google Web Services of Cloud Computing