Which team did the Dallas Cowboys defeat in Super Bowl XII?

Fred Biletnikoff was named MVP of which Super Bowl? In which city was Super Bowl XI played? Which head coach led the Oakland Raiders to victory in Super Bowl XI? In what year was Super Bowl XI played? In which city was Super Bowl XII played? Which head coach led the Dallas Cowboys to victory in Super Bowl XII? In what year was Super Bowl XII played? Which team did the Pittsburgh Steelers defeat in Super Bowl XIII?