My question is about below:

The confusion matrix of a 3NN classifier is: Actual cat 2 dog Predicted cat snake dog 6 3 1 snake 0 0 8 6 1 a. What's the accuracy of the 3NN? b. What's the precision (positive predictive value) of the 3NN in terms of classifying dogs? c. What's the false negative rate of the 3NN in terms of classifying snakes