50. When testing the quality of a small DC light bulb, if you turn the range selector of the digital multimeter to 200 in the ohm range, and then touch the test rod to the top of the bulb thread and the thread respectively, the panel value will show "5.7", what is the resistance value of the bulb？ (A) 5.7KΩ (B) 5.7Ω (C) 5.7MΩ (D) This bulb is broken and cannot be measured