Who among the following was not a member of the Indian Constituent Assembly ?

Socialist leader Jayaprakash Narayan was not a member of the Indian Constituent Assembly because the Socialist Party boycotted the Assembly, viewing it as an unrepresentative body created under the British Cabinet Mission Plan, whereas Dr. M.R. Jayakar, Sir Firoz Khan Noon, and Sir Muhammad Zafarullah Khan were elected members of the Constituent Assembly.