This question may on your test. What are the standard callsign formats? 1X2, 2X2, 1X3, 2X3, no 3X3.
So WWJ6YUZ is not a valid amateur call sign.
I checked
www.qrz.com and the second one WJ6YUZ is not currently assigned, so you might have a shot at that one. And it is a group d call so it's available to a Tecnician class licensee.