yup correct !!
here is an official one from www.cfv-cafe.blogspot.com
A: [永] - Passive
- This ability will activate during your turn as long as the unit is on the field.
- You cannot choose not to activate this ability, unless otherwise stated.
B: [起] - Activate
- This ability can only be activated during your main phase.
- You can choose to activate or not activate this ability.
- You may activate this ability multiple times in your main phase, unless otherwise stated.
C: [自] - Auto
- This is a compulsory ability and will activate as long as the condition(s) are met.
- However, You may choose to activate the effect or not, only if [～してもよい] [you may~] is written in the text.