Is there a SmartObject that gives you the list of users that approved within the workflow when the workflow is rejected at a later step?

Activity A, User 1, 2 approved

Activity B, User 3 approved

Activity C, User 4 rejected.

I want to send email to user 1,2,3 dynamically through workflow without having to cache/capture user 1,2,3 and reuse it.

This is done for K2 .NET 2003, does Blackpearl offer something through its SmartObject?

Select distinct [User] from _ActInstDest WITH (NOLOCK) where Status=2 ProcInstID=?"

Status 2 = completed.