Explanation: A transformer's output voltage is directly proportional to the number of turns in its secondary winding relative to the primary. To produce 150 volts, that secondary winding must have a significantly greater number of turns compared to the windings producing 5.0 volts or 12.6 volts. Assuming similar wire sizes (gauge), the DC resistance of a winding is primarily determined by the total length of the wire used. Since the 150-volt winding requires the most turns, it will use the longest length of wire. A longer wire, with the same cross-sectional area, will naturally have a higher measured DC resistance. Therefore, the 150-volt winding will exhibit the highest DC resistance.