Which of the following statements represents the FIRST precaution to be taken prior to working on any installed electrical component （）<br>A:Wear rubber gloves and boots<br>B:Use only approved non-conducting tools<br>C:Ground the case of the machine before beginning any repairs<br>D:Open the supply circuits and tag the switches

Which of the following statements represents the FIRST precaution to be taken prior to working on any installed electrical component （）
A:Wear rubber gloves and boots
B:Use only approved non-conducting tools
C:Ground the case of the machine before beginning any repairs
D:Open the supply circuits and tag the switches

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