Which of the following is true of the future of mobile targeting?

Customers will become less accustomed to direct messages from companies

Notification$-$based ads will lose popularity in the United States

Direct notifications will be welcomed as companies' targeting becomes more effective

Both A and $B$

Ad Rank is based

Just on "winning" a location bid

Just on the ad's Quality Score

On "winning" a location bid and on the ad's Quality Score

None of the above