How Does an Executive Information System (EIS) Differ from a Decision

How does an executive information system (EIS) differ from a decision support system (DSS) ?

A) An EIS answers "what-if" questions; a DSS does not.
B) All EIS are provided by application service providers, and DSS are typically purchased.
C) EIS is customized for an individual executive, and DSS is not.
D) An DSS answers "what-if" questions; an EIS does not.
E) An EIS is a communication system while a DSS is a transaction system.