IPAD 2

What do you mean by "what kind of Zoom"?

If you mean Zoom the video conferencing app, then there's only one kind Zoom app for iOS devices.

The Zoom app is available for devices running iOS 8 or later, so should work on an iPad 2 running iOS 9.3.5 / 9.3.6

See here: https://apps.apple.com/us/app/zoom-cloud-meetings/id546505307

The iPad 2, released by Apple in 2011, can run an iOS version no greater than iOS 9.3.5 (9.3.6 for a cellular model).

UPDATE - I had incorrect information here. Phil0124 is correct.