Classify the following attributes as binary, discrete, or continuous. Also

classify them as qualitative $($nominal or ordinal$)$ or quantitative $($interval

or ratio$).$ Some cases may have more than one interpretation, so briefly

indicate your reasoning if you think there may be some ambiguity. The

answer must be a list of three strings.

$($a$)$ Number of courses registered by a student in a given semester.

$($b$)$ Speed of a car $($in miles per hour$).$

$($c$)$ Decibel as a measure of sound intensity.

$($d$)$ Hurricane intensity according to the Sar$-$Simpson Hurricane Scale.

$($e$)$ Social security number.