The correct option is A ₹500 and ₹100
600 can be formed by all these 3 given ways.
600 = 100 + 100 + 100 + 100 + 100 + 100
600 = 200 + 200 + 200
600 = 500 + 100
But the option with minimum number of notes is 500 + 100.
So, the minimum number of notes required to form ₹600 are one ₹500 note and one ₹100 note.