Cameron is a director of a public company, which does not have a constitution. Which statement below is correct as to how this company may legally operate?

a. A company can have a combination of both replaceable rules from the Corporations Act and a constitution.

b. A company can change the rules in the Corporations Act which are not replaceable by passing a special resolution.

c. A company is not required to have a constitution before registration, but it is unable to adopt a constitution after registration.

d. A company can change its constitution at any time by passing an ordinary resolution