Medical researchers daim that COVID-19 cases might differ by region. Of 300 tests implemented in Region A 45% of them is reported as positive cases. Of 200 tests implemented in Region B, 25% of them is reported as positive cases. Construct 99% confidence interval for the difference between the two population proportions of the positive cases in Region A and B.

a) 0,102

b) 0,092

c) 0,114

d) 0.118