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During peak periods, John’s Employment Business (JOB) places temporary workers incompanies. JOB’s manager gives you the following description of the business:• JOB has a file of candidates who are willing to work.• If the candidate has worked before, that candidate has a specific job history.(Naturally, no job history exists if the candidate has never worked.) Each time thecandidate works, one additional job history record is created.• Each candidate has earned several qualifications. Each qualification may be earnedby more than one candidate. (For example, it is possible for more than one candidateto have earned a BBA degree or a Microsoft Network Certification. And clearly, acandidate may have earned both a BBA and a Microsoft Network Certification.)• JOB offers courses to help candidates improve their qualifications.• Every course develops one specific qualification; however, JOB does not offer acourse for every qualification. Some qualifications have multiple courses thatdevelop that qualification.• Some courses cover advanced topics that require specific qualifications asprerequisites. Some courses cover basic topics that do not require any prerequisitequalifications. A course can have several prerequisites. A qualification can be aprerequisite for more than one course.• Courses are taught during training sessions. A training session is the presentationof a single course. Over time, JOB will offer many training sessions for eachcourse; however, new courses may not have any training sessions scheduled rightaway.• Candidates can pay a fee to attend a training session. A training session canaccommodate several candidates, although new training sessions will not have anycandidates registered at first.• JOB also has a list of companies that request temporaries.• Each time a company requests a temporary employee, JOB makes an entry in theOpenings folder. That folder contains an opening number, a company name,required qualifications, 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, the job is assigned, and an entry ismade in the Placement Record folder. That folder contains an opening number, acandidate number, the total hours worked, etc. In addition, an entry is made in thejob history for the candidate.• An opening can be filled by many candidates, and a candidate can fill manyopenings.• JOB uses special codes to describe a candidate’s qualifications for an opening. 
HELP, what is the erd ?

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