In Cisco Unified Contact Center Express, When a Variable in the Application

In Cisco Unified Contact Center Express, when a variable in the application editor is defined as a parameter, which statement is true?

A) The variable can be used to pass data to and from subflows.
B) The value for that variable can be supplied through the Application Management menu in Cisco Unified CCX Administration.
C) The value for that variable is defined by the calling application.
D) The variable can be used in conditional steps.
E) The variable can be used to pass data to and from VoiceXML applications.