The correct answer is B) The low voltage winding is the secondary coil. In a transformer used to step down voltage, the low voltage winding is the secondary coil. The primary coil, which is connected to the high voltage input, induces a magnetic field in the transformer core. This magnetic field then induces a lower voltage in the secondary coil, which is the low voltage winding. The secondary coil has fewer turns than the primary coil, resulting in the stepped-down voltage output. The other options are incorrect because: A) The low voltage winding is not part of the core, it is a separate coil. C) The primary coil is the high voltage winding, not the low voltage winding. D) The low voltage winding is insulated, just like the primary winding, to safely handle the electrical current.