Consider the following about Prime Minister's office:(i) It is a think-tank of the Prime Minister.(ii) It is an extra-constitutional body.(iii) It was given status of a Department under the Government of India Transaction of Business Rules.(iv) Administratively it is headed by the Cabinet Secretary.Select correct answer using the codes given below:Codes:

• A. (i) and (ii)
• B. (i) (ii) and (iii)
• C. (i) (iii) and (iv)
• D. (i) (ii) (iii) and (iv)