Will Apple's Large-Screened Foldable be an iPad or a Mac?

Along with a foldable iPhone, Apple is working on a larger foldable device that's somewhere around 19 inches, but rumors have been split on whether it's an iPad or a Mac. Some reports refer to the device as an ‌iPad‌, while some call it a Mac, and the split seems to come down to the operating system on the device.
Is it a Mac?
Some rumors have suggested that Apple is developing a foldable MacBook with an all-display design. The MacBook already has a foldable design, of course, but the