Question $30(2\mathrm{.}5$ points$)$

Your client is a food vendor that operates in a stadium, for any event that is held

there. You are designing a food ordering kiosk that will facilitate filling orders. One

of the requirements you define is "the system shall add a $5\%$ sales tax to the

calculated sub$-$total of any order." This is an example of a$($n$)$:

a$)$ user requirement

b$)$ non$-$functional requirement

c$)$ internal quality attribute

d$)$ functional requirement

e$)$ business rule