A transformer in a computer is used to change the mains voltage from $240\,\text{V}$ to $12\,\text{V}$.\n\nThe secondary coil has 2000 turns.\n\nWhich statement concerning the transformer is correct?
- AIt is a step-down transformer and has 100 turns on its primary coil.
- BIt is a step-down transformer and has 4000 turns on its primary coil.
- CIt is a step-up transformer and has 100 turns on its primary coil.
- DIt is a step-up transformer and has 4000 turns on its primary coil.