179. Which of the following statements is true concerning the illustrated gauge manifold set

The valves labeled "G" and "C" must both be open to read system pressures on the respective gages labeled "A" and "B".
Closing the valve labeled "G" isolates the port labeled "H" from the port labeled "J".
Opening fully and back-seating the valve labeled "G" isolates the gauge labeled "A" from the port labeled "H".
Closing the valve labeled "G" isolates the port labeled "H" from the gauge labeled "A".

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