What kind of testing involves creating two versions of an ad$,$ showing both at random across the ad network?

$1-$to$-2$ testing

Dual testing

A$/$B testing

Counter testing

Which is NOT true when it comes to the topic of targeting the right audience?

Placing ads on appropriate websites and apps is critical to effective online advertising

The better an advertiser can target the right audience, the more the advertiser is willing to pay for advertising

To find the right places to advertise online, advertisers begin by selecting general interests for their customers

Display ads often perform equally well on mobile devices and desktop computers