which base type should your custom event type inherit?

You create a large, n-tier Web application that has a custom event tracking system. You need to create a custom event type that enables your event tracking system to record all relevant event details for all types of events. The events must be stored in Microsoft SQL Server.
From which base type should your custom event type inherit?

A.
IWebEventCustomEvaluator

B.
WebEventProvider

C.
WebBaseEvent

D.
WebAuditEvent