YouarecreatinganASP.NETWebsite.ThesitehasamasterpagenamedCustom.master.Thecode-behindfileforCustom.mastercontainsthefollowingcodesegment.YoucreateanewASP.NETpageandspecifyCustom.masterasitsmasterpage.YouaddaLabelcontrolnamedlblRegiontothenewpage.Youneedto

YouarecreatinganASP.NETWebsite.ThesitehasamasterpagenamedCustom.master.Thecode-behindfileforCustom.mastercontainsthefollowingcodesegment.YoucreateanewASP.NETpageandspecifyCustom.masterasitsmasterpage.YouaddaLabelcontrolnamedlblRegiontothenewpage.Youneedtodisplaythevalueofthemasterpage’sRegionpropertyinlblRegion.Whatshouldyoudo？（）

A.AddthefollowingcodesegmenttothePage_Loadmethodofthepagecode-behindfile. CustomMastercustom=this.ParentasCustomMaster；lblRegion.Text=custom.Region；

B.AddthefollowingcodesegmenttothePage_Loadmethodofthepagecode-behindfile.CustomMastercustom=this.MasterasCustomMaster；lblRegion.Text=custom.Region；

C.AddthefollowingcodesegmenttothePage_LoadmethodoftheCustom.Master.cscode-behindfile.LabellblRegion=Page.FindControl（"lblRegion"）asLabel；lblRegion.Text=this.Region；

D.AddthefollowingcodesegmenttothePage_LoadmethodoftheCustom.Master.cscode-behindfile.LabellblRegion=Master.FindControl（"lblRegion"）asLabel；lblRegion.Text=this.Region；