For the business rules given below, draw an ERD$/$EERD

In addition, provide an explanation for each business rule in the following format:

"A relationship between customer and purchase $($see above$)$ is $1$:M as every customer may have many purchases and each purchase belongs to only one customer. The relationship is optional on the $$many$$ side because business rules say that every customer $$may$$ have a purchase. It is mandatory on the $$one$$ side because business rules say that every purchase $$must$$ belong to a customer. According to business rules, the cardinality on the many sides is $(0,$ N$)$ because it is optional and $(1,1)$ for the one side because it is mandatory. A weak relationship will be used as purchases are not dependent on customers. $"$

Business Rules:

During peak periods, Temporary Employment Corporation $($TEC$)$ places temporary workers in companies. TEC$$s manager gives you the following description of the business:

$$ TEC has a file of candidates who are willing to work and a list of companies that request temporaries.

$$ If the candidate has worked before, that candidate has a specific job history. Each time the candidate worked, one additional job history record was created.

$$ Each candidate has earned several qualifications. Each qualification may be earned by more than one candidate.

$$ Each time a company requests a temporary employee, TEC makes an entry in the Openings folder. That folder contains an opening number, a company name, required qualification, a starting date, an anticipated ending date, and hourly pay.

$$ Each opening requires only one specific or main qualification.

$$ When a candidate matches the qualification, $($s$)$he is given the job and an entry is made in the Placement Record folder. That folder contains an opening number, a candidate number, the total hours worked, etc. In addition, an entry is made in the job history for the candidate.