What metric-dimension combination is not valid?

What scope would be set for a Custom Dimension that reports membership status for a customer rewards program?

Session Hit Product User Download Google Analytics Individual Certification Exam Answers (PDF)

What scope levels available for dimensions and metrics?

Event-level, session-level, transaction-level, or user-level scope Location-level, duration-level, product-level, or user-level scope Hit-level, session-level, product-level, or user-level scope Event-level, duration-level, transaction-level, or user-level scope Download Google Analytics Individual Certification Exam Answers (PDF)

To recognize users across different devices, what feature must you enable?

User ID AdWords Linking Audience Definitions Attribution Models Download Google Analytics Individual Certification Exam Answers (PDF)