ImagineapublishingcompanythatmarketsbothbooksandCDs.ThiscompanyaskedyoutowriteaprogramtodisplaytheirproductsproperlyontheWeb.Afterstudyingtheirrequirements,youfoundouttheinformationrequiredforbooksincludesbooktitle,price,authorname,andpagenumbers.TheinformationrequiredforCDsareCDtitle,price,singer'sname,andplayingtime.Pleasedesignanappropriateinheritancehierarchyforthisprogram.