Which of the following conditions are necessary for the issue of 'writ' of quo-warranto?A. The office must be public and must be created by a statute or by the Constitution itselfB. The office must be a substantive one and not merely the function or employment of a servant at the will and during the pleasure of another.C. There has been a contravention of the Constitution or a statutory instrument, in appointing such person to that office.Choose the correct answer:

• A. A, B and C
• B. B and C only
• C. A and C only
• D. A and B only