Question $31(2\mathrm{.}5$ points$)$

You have developed and delivered a system to a local retailer. You client tells you

that they have literally cut their training costs in half because of how easy it is for

new employees to use the system. Your system is:

a$)$ robust

b$)$ usable

c$)$ reliable

d$)$ available

$30$ of $40$ divestions saved