What campaigns require manual tags on destination URLs for tracking?

• AdWords campaigns
• Email campaigns
• AdWords and email campaigns
• None of the above

Correct answer is:

• Email campaigns

Explanation: By adding campaign parameters to your URLs, you can identify the campaigns that send traffic to your site. When a user clicks a referral link, these parameters are sent to Analytics, so you can see the effectiveness of each campaign in your reports. Google Adwords gives you an option to track campaign using auto-tagging.

Read more here: https://support.google.com/analytics/answer/1033863