What feature would be used to collect how many times users downloaded a product catalog?

What feature is required to collect the number of comments users posted to a web page?

Custom Metric Custom Channel Groupings Custom Dimension Calculated Metric Download Google Analytics Individual Certification Exam Answers (PDF)

Which reports indicate how website referrals, organic search, and ad campaigns assisted in conversions?

Multi-Channel Funnel reports Goals reports Acquisition reports Ecommerce reports Download Google Analytics Individual Certification Exam Answers (PDF)

What data does Google Analytics prohibit collecting?

Billing city Personally identifable information Purchase amount Product SKU(s) Download Google Analytics Individual Certification Exam Answers (PDF)