$(25$ points$)$

The FlyRight Aircraft Maintenance $($FRAM$)$ division of the FlyRight Company $($FRC$)$

performs all maintenance for FRC$\text{'}$s aircraft. Assume the following business rules reflect

how FRAM goes about its business:

All mechanics are FRC employees. Not all employees are mechanics.

Some mechanics are specialized in engine $($EN$)$ maintenance. Some mechanics are

specialized in airframe $($AF$)$ maintenance. Some mechanics are specialized in

avionics $($AV$)$ maintenance. $($Avionics are the electronic components of an aircraft

that are used in communication and navigation.$)$ All mechanics take periodic

refresher courses to stay current in their areas of expertise. FRC tracks all course

taken by each mechanic$-$date, course type, certification $($Y$/$N$),$ and performance.

FRC keeps a history of the employment of all mechanics. The history includes the

date hired, date promoted, date terminated, and so on$.($Note: The "and so on$"$

component is$,$ of course, not a real$-$world requirement. Instead, it has been used here

to limit the number of attributes you will show in your design.$)$

Given those requirements, create an ERD that accurately depicts this scenario.