AcompanythatmakesComputerAssistedDesign（CAD）softwarehas，withinitsapplication，someutilityclassesthatareusedtoperform3Drenderingtasks.Thecompany’schiefscientisthasjustimprovedtheperformanceofoneoftheutilityclasses’keyrenderingalgorithms，andhasassignedaprogrammertoreplacetheoldalgorithmwiththenewalgorithm.Whentheprogrammerbeginsresearchingtheutilityclasses，sheishappytodiscoverthatthealgorithmtobereplacedexistsinonlyoneclass.The programmerreviewsthatclass’sAPI，andreplacestheoldalgorithmwiththenewalgorithm，beingcarefulthatherchangesadherestrictlytotheclass’sAPI.Oncetestinghasbegun，theprogrammerdiscoversthatotherclassesthatusetheclassshechangedarenolongerworkingproperly.
Whatdesignflawismostlikelythecauseofthesenewbugs？（）