Solution:Some of the duties and functions of the Chief of Defence Staff (CDS) include the following:To head the Department of Military Affairs in Ministry of Defence and function as its Secretary.
To act as the Principal Military Advisor to Hon'ble Raksha Mantri on all Tri-Service matters. Hence, Statement 3 is correct.
To function as the Permanent Chairman of the Chiefs of Staff Committee.
Hence, Statement 1 is correct.
To administer the Tri-Service organizations/agencies/commands.
To be a member of Defence Acquisition Council chaired by Hon'ble Raksha Mantri.
CDS will not exercise any military command, including over the three Service Chiefs, so as to be able to provide impartial advice to the political leadership. Statement 2 is incorrect.
Thus, Hence, Option (d) is the correct answer.