Jane is setting up an ad group to track call-extension conversions for a client. She has set up quite a few call extensions for this campaign and would like to track them within one ad group. How many can Jane track within one ad group?

DoubleClick Search (DS) allows you to track conversions from only one call extension per ad group. While you can have multiple call extensions associated with a campaign or ad group, DS's conversion tracking for call extensions is limited to a single instance at the ad group level. This means if you have several call extensions, you'll need to choose which one's conversions you want to attribute within that specific ad group. The options 10, 20, and 2 are incorrect because they exceed the one-per-ad-group limit for call extension conversion tracking in DS.