A solution of Na₂S₂O₃ is standardized iodometrically against 0.1252 g of KBrO₃. This process required 45 mL of Na2S2O3 solution. What is the normality of Na₂S₂O₃? (K = 39, Br = 80)

a) 0.0125 N
b) 0.0250 N
c) 0.0556 N
d) 0.1111 N