Subsystem A requires two voltages V1 and V2 with equal power ratings. Power conversion scheme adapted for the power supply design is shown in the following figure. Whatis the overall power conversion efficiency?

A

$$\frac{(1 * (2}{(1 + (2}$$

B

$$\eta 1 * \eta 2$$

C

$$\frac{2(1 * (2}{1 + (2}$$

D

$$\frac{2(1 * (2}{1 + (1}$$