To prepare a 250 ml solution of m/20 oxalic acid, with the help of this solution, find the molarity and strength of KMnO4 solution.
a) Molarity: m/20, Strength: m/20
b) Molarity: 2m/20, Strength: m/20
c) Molarity: m/10, Strength: m/20
d) Molarity: m/20, Strength: m/10