Which fact is true about the Indian Parliamentary Committee?

• A. Parliamentary committees by their nature are of two types: Standing Committees and Ad-hoc Committees.
• B. Standing Committees are standing and regular committees constituted from time to time in accordance with the provisions of an Act of Parliament or the Rules of Procedure and Conduct of Business of the Lok Sabha.
• C. Ad-hoc committees are appointed for a specific purpose and cease to exist when they finish their work and submit their report.
• D. All of the above