Which of the following is$/$are true about the Confusion Matrix?

confusion matrix.jpg

$1.$ It is used to visualize the performance of a classifier.

$2.$ The upper left and lower right correspond to correct$/$true classifications.

$3.$ It helps in analyzing Type $1$ and Type $2$ Errors for a given classifier.

$4.$ The lower left and upper right correspond to incorrect$/$false classifications.