A transformer has 400 turns as its primary winding and 100 turns as secondary winding.
If the primary coil is connected to a \(12 \mathrm{~V}\) source, the transformer functions as ____________

A. a step-down transformer with secondary emf \(=6 \mathrm{~V}\)
B. a step-down transformer with secondary emf \(=3 \mathrm{~V}\)  
C. a step-up transformer with secondary emf- 24V
D. a step-up transformer with secondary emf- \(48 \mathrm{~V}\)

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Correct Answer: B