Co-star or guest star?

Hi, I need help to determine if a role I booked is a co-star or guest star for resume purposes. I booked a cool role on a new tv show. I am in 3 scenes. One scene I don’t have any lines. The other 2 I have lines. The last scene I’m in is a pivotal/climax of the episode.

I’ve heard if it’s 5 lines or under it’s a co-star. So based on lines I had 6 lines total. I was only booked for a day. The role was considered as a Day Player.

Not sure how to put it on my resume? Any help is appreciated. Thank you!