Hello tutors, I just need the meaning/explanations and examples of numbers 1-3. Thank you!

Status of Ultra Vires Acts by the Corporation 1. Ultra vires acts which are illegal per se Null and void 2. Ultra vires acts for failure to complyr with voting formality required by law Null and void but the declaration of nullity may be barred by estoppel 3. Ultra vires acts for being outside the primaryr and secondary purposes of the corporation Voidable on the part of the other party