Concerning pressure-relief valves, what statement is true?
No stop isolation valve may be installed between the relief valve and its source of pressure, and no stop isolation valve may be installed in the relief valve discharge piping.
It is permissible to install a stop isolation valve between the relief valve and its source of pressure, but no stop isolation valve may be installed in the relief valve discharge piping.
It is permissible for a stop isolation valve to be installed between the relief valve and its source of pressure, and it is permissible for a stop isolation valve to be installed in the relief valve discharge piping.
No stop isolation valve may be installed between the relief valve and its source of pressure, but it is permissible for a stop isolation valve to be installed in the relief valve discharge piping.
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