6. (10 marks) Suppose we have a new language, whose syntax is very similar to Pascal. Consider the following code segment. procedure Main is X: Integer; procedure Subl is X: Integer procedure Sub2 is X : Integer; begin end; begin end; procedure sub3 is begin end; begin end; (6.1) (3 marks) Assume that static scoping rule is used. For the following calling sequence, which declaration of X is used if we reference it in each procedure on the sequence, respectively? Main Sub1 Sub2 + Sub3