Classify each labeled point on the graph. Point P: a relative maximum a relative minimum a saddle point a critical point but neither a relative extremum nor a saddle point none of the above Point Q: a relative maximum a relative minimum a saddle point a critical point but neither a relative extremum nor a saddle point none of the above Point R: a relative maximum a relative minimum a saddle point a critical point but neither a relative extremum nor a saddle point none of the above