Who played Effie when "Dreamgirls" opened on Broadway?

When "Dreamgirls" made its Broadway debut in 1981 it gave us one of the greatest musical theater moments ever. Night after night, audiences alternated between clapping and crying during "And I Am Telling You I'm Not Going." If you somehow forgot, it's the incredible song that brings the house down at the end of Act One. Who was the first person to absolutely own that stage as Effie?