Which of the following statements regarding the application of electrical conduction via gases is/are correct?
Electrical conduction in gas is applied in:
(i) The identification of gases
(ii) Lighting/fluorescent tubes
(iii) Photocells
(iv) Cathode ray oscilloscope/T.V. tubes



A. (i), (iii) and (iv) only
B. (i), (ii) and (iv) only  
C. (ii), (iii) and (iv) only
D. (i), (ii) and (iii) only

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Correct Answer: B