Which of the following statements regarding negative predictive value $($NPV$)$ is$/$are true?$$

Which of the following statements regarding negative predictive value $($NPV$)$ is$/$are true?$$

NPV represents the probability that a patient does not have a disease if the test is negative

NPV is calculated by diving the number of true negatives by the total number of negatives

NPV is a measure of validity

All of the above