Star Wars: Knights of the Old Republic/Canderous

Second level up
If you select this option, Canderous won't tell you about it until you next level up. Otherwise:

Third level up
If you select this option, Canderous won't tell you about it until you next level up. Otherwise:

Sixth level up
This is as far as you can advance this quest before leaving Taris. However, you'd need to level six times after he joins your party to do this (so a level 2 character would have to be able to level up to 8, while a level 8 character would have to be able to level up to 14).