A transfommer-coupled dc-dc converter is shown in the figure below. Assume the transformer isideal. What is the voltage conversion ratio VB/VA forthis converter assuming periodic steady-state continuous conduction mode operation?

(Select the one best answer from the choices givenbelow.) \text { (a) } \frac{V_{B}}{V_{A}}=\frac{N D}{1-D} \text { (b) } \frac{V_{B}}{V_{A}}=\frac{N}{1-D} \text { (c) } \frac{V_{B}}{V_{A}}=N D \text { (e) } \frac{V_{B}}{V_{A}}=\frac{1-D}{N} \text { (f) } \frac{V_{B}}{V_{A}}=\frac{1}{N D} \text { (g) } \frac{V_{B}}{V_{A}}=-\frac{N D}{1-D} \text { (h) } \frac{V_{B}}{V_{A}}=-\frac{N}{1-D} \text { (i) } \frac{V_{B}}{V_{A}}=-N D \text { (j) } \frac{V_{B}}{V_{A}}=-\frac{(1-D)}{N D} \text { (k) } \frac{V_{B}}{V_{A}}=-\frac{(1-D)}{N} \text { (I) } \frac{V_{B}}{V_{A}}=-\frac{1}{N D}