$(7$ Points$)$ We also calculated the Area Under the Receiver Operating Characteristic Curve

$($AUC$),$ resulting in a value of $92\%.$ The corresponding ROC plot is depicted below, featuring

two points labeled as A and $B.$ Provide a brief explanation of how sensitivity and specificity are

computed for the two points A and $B$ on the ROC plot.

$(5$ Points$)$ In the context of ROC curves, what does an AUC of $0\mathrm{.}5$ signify?