Correct option is D
The Lok Sabha Secretariat functions directly under the control and supervision of the Speaker of the Lok Sabha. It is independent of the executive branch of the government, including the Ministry of Parliamentary Affairs.
The Speaker of the Lok Sabha is responsible for all administrative and operational matters within the Secretariat, including matters related to Parliament sessions, committees, and facilities for members of Parliament.
This ensures the autonomy of the legislative body from the executive.