Consider the following program: procedure Main is X, Y, Z: Integer; procedure Sub1 is A, Y, Z: Integer; procedure Sub2 is A, B, Z: Integer; begin - of Sub2 end; -- of Sub2 begin - of Sub1 end; -- of Sub1 procedure Sub3 is A, X, W: Integer; begin - of Sub3 ... end; -- of Sub3 begin - of Main ... end; -- of Main List all the variables, along with the program modules where they are declared, that are visible in the bodies of Sub1, Sub2, and Sub3, assuming static scooping is used