Here’s what I have:
A SSD that runs Windows.
Two 4TB drives that are already mirrored (and I don’t remember how I did that).
The mirrored drives are full, so I added two more 4TB drives. I’d like the 2 new drives to mirror each other.

I’m in Disk Management and when I right click the new drives, there’s no option for mirrored volume. There are only options for simple, spanned, and striped, and if I understand correctly, that’s not what I want.

Any guidance please? The guidance I’m finding online either doesn’t match what I’m seeing on the screen or it’s written in such technical terms that I can’t decipher it.