• Online point-of-sale systems
• Offline inventory database
• Websites
• Mobile devices

Right answer is

• Offline inventory database

Explanation:-

Google analytic cannot collect data from Offline inventory database by default. You need “Data import” for this job. With the help of this you can upload offline data in to Google Analytics and can plana journey from online to offline system. For more information visit at

https://support.google.com/analytics/answer/3191589?hl=en