Computer Sciences Department frequent fliers have been complaining to Dane County Airport officials about the poor organization at the airport. As a result, the officials decided that all information related to the airport should be organized using a DBMS$,$ and you have been hired to design the database. Your first task is to organize the information about all the airplanes stationed and maintained at the

airport. The relevant information is as follows:

Every airplane has a registration number, and each airplane is of a specific model.

The airport accommodates a number of airplane models, and each model is identified

by a model number $($e$.$g$.,$ DC$-10)$ and has a capacity and a weight.

A number of technicians work at the airport. You need to store the name, SSN$,$ address, phone number, and salary of each technician.

Each technician is an expert on one or more plane model$($s$),$ and his or her expertise may overlap with that of other technicians. This information about technicians must also be recorded.

Traffic controllers must have an annual medical examination. For each traffic controller, you must store the date of the most recent exam.

All airport employees $($including technicians$)$ belong to a union. You must store the union membership number of each employee. You can assume that each employee is uniquely identified by a social security number.

The airport has a number of tests that are used periodically to ensure that airplanes are still airworthy. Each test has a Federal Aviation Administration $($FAA$)$ test number, a name, and a maximum possible score.

The FAA requires the airport to keep track of each time a given airplane is tested by a given technician using a given test. For each testing event, the information needed is the date, the number of hours the technician spent doing the test, and the score the airplane received on the test.

Draw an Entity$-$Relationship diagram that represents the above description.

Remember to show the names of entity, names of attributes, identifiers, relationship names, cardinality ratios for relationships, weak entities $($if any$)$ and generalization hierarchies $($if any$).$