Q: Which of these can join offline business systems data with online data collected by Google Analytics?
A) Goal tracking
B) AdWords Linking
C) User ID
D) Data import
Correct Answer is D) Data import.
Data Import lets you join the data generated by your offline business systems with the online data collected by Analytics. This can help you organize, analyze and act upon this unified data view in ways that are better aligned with your specific and unique business needs. For example, as a web publisher, you could join hits collected by Analytics with data dimensions exported from your CMS and CRM systems to analyze the relative contributions of authors to your site.
Read more here: https://support.google.com/analytics/answer/3191589