שאלה | What does Specificity measure in a classification scenario?

What does Specificity measure in a classification scenario?

		The model's ability to correctly identify positive instances out of all actual positive instances.
		The model's ability to correctly identify positive instances out of all instances it classified as positive.
		The model's ability to correctly identify negative instances out of all actual negative instances.
		The proportion of actual negative instances that are incorrectly classified as positive by the model.