Refertotheexhibit.AjuniornetworkadministratorwasgiventhetaskofconfiguringportsecurityonSwitchAtoallowonlyPC_Atoaccesstheswitchednetworkthroughportfa0/1.Ifanyotherdeviceisdetected,theportistodropframesfromthisdevice.TheadministratorconfiguredtheinterfaceandtesteditwithsuccessfulpingsfromPC_AtoRouterA,andthenobservestheoutputfromthesetwoshowcommands.WhichtwoofthesechangesarenecessaryforSwitchAtomeettherequirements?()