How do you determine the classifier accuracy from the confusion matrix?

How do you determine the classifier accuracy from the confusion matrix?

  •  Divide the sum of the diagonal values in the confusion matrix by the sum of the off-diagonal values.
  •  Divide the sum of all the values in the confusion matrix by the total number of samples.
  •  Divide the sum of the diagonal values in the confusion matrix by the total number of samples.
  •  Divide the sum of the off-diagonal values in the confusion matrix by the total number of samples.

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