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How is NO converted to NO2 for analysis in UV and Visible analyzers?

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How is NO converted to NO2 for analysis in UV and Visible analyzers?

(a) Treating sample gas with pressurized oxygen

(b) Treating sample gas with ozone

(c) Treating sample gas with oxygen at low pressure

(d) Treating sample gas with water at high pressure

I got this question in an international level competition.

Question is from NO2 Analyser topic in chapter Industrial Gas Analysers of Analytical Instrumentation

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Correct option is (a) Treating sample gas with pressurized oxygen

The best I can explain: NO is converted into NO2 for analysis in UV and Visible analyzers by treating sample gas with pressurized oxygen. This is because direct measurement of NO is not possible using UV and Visible analyzers.

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