Rs. 50 Notes Signed by Shaktikanta Das put into circulation

The Reserve Bank of India put into circulation 50 Rupees denomination banknotes signed by its Governor Shaktikanta Das.

1. The RBI in Mumbai said the design of these notes is similar in all respects to 50 banknotes in Mahatma Gandhi new series.
2. It also said that all banknotes in the denomination of 50 issued by the Reserve Bank in the past will continue to be legal tender.

Question:

Q. The Reserve Bank of India has put into circulation which denomination banknotes signed by its Governor Shaktikanta Das?
a. 50 Rupees
b. 100 Rupees
c. 500 Rupees
d. 2000 Rupees