Under whose purview does the issue of new currency fall in ........

Introductory Macro Economics Money and banking

Read the below case and answer the questions that follow:
In a 40 minute long speech Prime Minister Narendra Modi announced the demonetisation of existing notes of 500 and 1,000 during a televised address on Tuesday evening.
Modi announced that the notes of Rs.500 and Rs.1,000 "will not be legal tender from midnight tonight" and these will be "just worthless pieces of paper. PM also urged people to join this mahayojna against the ills of corruption.
- "What is demonetisation and why was it done?"The Economic Times, Nov 09, 2016

Under whose purview does the issue of new currency fall in?

Reserve Bank of India

Central Government of India

State Government

All of the above