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Which of the following is/are the components of a CRT?

  1. Electron Gun
  2. Control Electrode
  3. Focusing Electrode
  4. Phosphor Coated Screen
    1. $\text{i and iv}$
    2. $\text{i, ii and iv}$
    3. $\text{i, ii, iii and iv}$
    4. $\text{i, iii and iv}$
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