Represents an Access Control Entry (ACE) that contains a qualifier. The qualifier, represented by an System.Security.AccessControl.AceQualifier object, specifies whether the ACE allows access, denies access, causes system audits, or causes system alarms. The System.Security.AccessControl.QualifiedAce class is the abstract base class for the System.Security.AccessControl.CommonAce and System.Security.AccessControl.ObjectAce classes.