Next Card Climax

The Weiß Schwarz Online Judge Test just closed, so I wanted to talk about one of the questions. I’ve put a modified version below:

Player A has 2 Reticent Sushi Chef, Hoshimachi Suisei on their stage (henceforth Chef #1 and Chef #2), and plays COMET on their climax area. All 4 AUTO abilities trigger and are in standby. Player A intends to use the CX Combos to play 2 STELLAR into the GALAXY, Hoshimachi Suisei (henceforth STELLAR #1 and STELLAR #2) onto the stage. Which of the following scenarios can occur?

1. Player A resolves the 1st AUTO ability of Chef #1, then the CX Combo of Chef #1, then the heal ability of STELLAR #1, then the 1st AUTO ability of Chef #2, then the CX Combo of Chef #2, then the heal ability of STELLAR #2.
2. Player A resolves the 1st AUTO ability of Chef #1, then the 1st AUTO ability of Chef #2, then the CX Combo of Chef #1, then the heal ability of STELLAR #1, then the CX Combo of Chef #2, then the heal ability of STELLAR #2.
3. Player A resolves the CX Combo of Chef #1, then the heal ability of STELLAR #1, then the 1st AUTO ability of Chef #1, then the CX Combo of Chef #2, then the heal ability of STELLAR #2, then the 1st AUTO ability of Chef #2.
4. Player A resolves the CX Combo of Chef #1, then the heal ability of STELLAR #1, then the 1st AUTO ability of Chef #2, then the CX Combo of Chef #2, then the heal ability of STELLAR #2, then the 1st AUTO ability of Chef #1.
5. Player A resolves the 1st AUTO ability of Chef #1, then the CX Combo of Chef #1, then the CX Combo of Chef #2, then the 1st AUTO ability of Chef #2, then the heal ability of STELLAR #2, then the heal ability of STELLAR #1.
6. Player A resolves the 1st AUTO ability of Chef #1, then the heal ability of STELLAR #1, then the 1st AUTO ability of Chef #2, then the CX Combo of Chef #2, then the heal ability of STELLAR #2, then the CX Combo of Chef #1.
7. Player A resolves the CX Combo of Chef #1, then the CX Combo of Chef #2, then the 1st AUTO ability of Chef #1, then the 1st AUTO ability of Chef #2, then the heal ability of STELLAR #1, then the heal ability of STELLAR #2.

Click here for answer & explanation