$(25$ points$)$ Objective: Distinguish between the four types of variables. Determine the shapes of histograms and box plots.

In the year $2034,$ Timothy Abeasi is a leading cybersecurit$][$ specialist. Classify each of the following random variables from Timothy's work as discrete, nominal, continuous or ordinal.

a$)$ The number of hours per month spent on cybersecurity training

b$)$ The types of business $($technology$,$ law firms, restaurants, etc.$)$ for which Timothy has provided cybersecurity services

The number of clients per month Timothy helps

d$)$ The severity of a cybersecurity issue $($mild$,$ moderate, extreme$)$