To make sure their mobile-optimized creatives are delivering properly, your home decor client should examine their campaign trafficking settings in Campaign Manager 360 to verify that their ads are mobile-friendly.

• They should modify their existing desktop display campaign within Campaign Manager 360.
• They should set up their campaign creatives in Campaign Manager 360 for mobile-friendly sizes and formats.
• They should configure their account in Campaign Manager 360 to include mobile devices, tablets, and mobile apps.
• They should examine their campaign trafficking settings in Campaign Manager 360 to see if their ads are mobile-friendly.

The correct answer is: They should examine their campaign trafficking settings in Campaign Manager 360 to see if their ads are mobile-friendly

Explanation: The answer “They should examine their campaign trafficking settings in Campaign Manager 360 to see if their ads are mobile-friendly” is partially correct but not the first and most direct thing to check.

The absolute first thing to verify is the targeting settings of the existing ads and placements. You need to ensure that mobile environments (like mobile web and mobile apps) are included in the targeting criteria for the placements where these mobile-optimized creatives are assigned. If mobile isn’t targeted, the ads won’t serve on mobile devices, regardless of how mobile-friendly they are.

While checking if ads are mobile-friendly (correct sizes, formats) is important for new creatives, for existing ones that might already be serving, verifying the targeting is the immediate first step to ensure they are even eligible to appear on mobile.