A client that owns a fine–dining restaurant in London wants to get more phone calls from people researching places to eat on their mobile phones. How should you optimize this client’s campaign to help achieve their goal?

Include a phone number in the client’s ad’s headlines and monitor performance with the mobile clicks-to-call segment
Include a phone number in the client’s ad’s headline and monitor performance with the top vs. other segment
Add call extensions to the client’s ads and monitor performance with the top vs. other segment
Add call extensions to the client’s ads and monitor performance with the mobile clicks-to-call segment – CORRECT