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What happens when high voltage is applied to the electrodes in electric dust collectors?

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What happens when high voltage is applied to the electrodes in electric dust collectors?

(a) Forms uniform electric field

(b) Corona is formed

(c) The whole system gets charged

(d) Ions move from emitting electrode to collecting electrode

I had been asked this question in an online quiz.

Question is from Coal Weighing Methods in section Steam Power Plant of Energy Engineering

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The correct answer is (b) Corona is formed

Easy explanation: When the high voltage is applied, it generates a unidirectional non uniform electric field having greater magnitude at the discharge electrodes. This result in a blue luminous glow called corona around them. This corona is an indication of negatively charged ionized gas molecules which travel from discharge electrodes to grounded collection electrodes.

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