Which of the following is the most correct order of using a ptl meter to measure the pH of a solution?  A)1. Switch on the pH meter, 2. Clean the electrode, 3. Calibrate the instrument, 4. Clean the electrode, 5. Measure the pH of the solution.  B)1. Switch on the pH meter, 2. Calibrate the instrument, 3. Clean the electrode, 4. Measure the pH of the solution, 5. Clean the electrode  C)1. Switch on the pH meter, 2. Clean the electrode, 3. Measure the pH of the solution, 4.Calibrate the instrument, 5. Clean the electrode D)1. Switch on the pH meter, 2. Calibrate the instrument, 3. Clean the elecyrode, 4. Clean the electrode, 5. Measure the pH of the solution

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