Consider the following scenarios and determine whether it demonstrates an effective audience targeting approach:
- Scenario 1: An ad set for a luxury car brand targets users based on high-income demographics and interest in luxury goods, using data from previous customer interactions.
- Scenario 2: A campaign for a new fitness app targets all users aged 18-65, regardless of their interests or fitness levels, aiming for maximum reach.
- Scenario 3: An online bookstore creates a lookalike audience based on its existing customers to target users for its new range of mystery novels.
- Scenario 4: A travel agency uses A/B testing in ad sets to compare the effectiveness of targeting by geographical location versus targeting based on travel interests.
Identify which scenarios are using effective audience targeting strategies.