Impedance of single phase, two winding transformer referred to primary side is 0.1 + j 0.6 p.u. The rating of the transformer is 200 $$\frac{V}{400}$$ V, 1 kVA. The per unit impedance is calculated on transformer base, then what is the equivalent impedance of transformer referred to secondary in ohms?

A

80 + j 400 Ω

B

5 + j 25 Ω

C

16 + j 80 Ω

D

None of the above