What is online interactive?

A.
It is the connection to the networks.

B.
It is an online chat room.

C.
It is an expensive UPS device.

D.
None of the above.

Explanation:
More expensive UPS devices are called online interactives, which provide some power conditioning along with battery backup.
References:
Charles J. Brooks, Server+ Certification Exam Cram 2 (Exam SK0-002), QUE Publishing, Indianapolis, 2006, pp. 227-240.