When is the Session_OnStart event fired?

A. Upon every request from an application by a client for an .asp document.
B. Upon the first request from an application by a client for any file in the application.
C. Upon the first request for an .asp document from an application by a client.
D. Upon the first request for the global.asa file, in which the event handler is located.
E. Upon the first request for an. html or .asp document from an application by client