The correct answer is: A. By a resolution passed in the meeting of the Board of Directors.
The secretary of a company is an officer of the company and is appointed by the board of directors. The board of directors can also remove the secretary from office by passing a resolution to that effect. The resolution must be passed by a majority of the directors present at the meeting, and the secretary must be given notice of the meeting and the proposed resolution.
The Registrar of Companies does not have the power to remove the secretary of a company from office. The only way that the Registrar of Companies can remove the secretary is if the secretary has been convicted of an offence under the Companies Act.
The Annual General Meeting of a company does not have the power to remove the secretary from office. The only way that the Annual General Meeting can remove the secretary is if the board of directors recommends that the secretary be removed, and the shareholders vote to remove the secretary.