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3. (8 points) Consider the Ada program given below. You will be asked to determine which variables are visible in a number of different sit- uations. In each case, identify each variable by its name and the line number of its declaration. 1. procedure Main is 2. A, B, C : Integer; 7. 8. procedure Subl is 4. D, E: Integer; 5. begin of Sub1 6. end; -- of Sub1 procedure Sub2 is 9. C, D : Integer; 10. procedure Sub3 is 11. B, D, F: Integer; 12. begin -- of Sub3 13. 14. end; -- of Sub3 15. begin -- of Sub2 16. 17. end; -- of Sub2 18. begin -- of Main 19. ... 20. end; -- of Main (a) Assuming that static scoping is used, say which variables are visible in the bodies of each of the procedures: Main, Subi, Sub2 and Sub3. (b) Assuming that dynamic scoping is used and the calling sequence is Main calls Subl; Subl calls Sub2; Sub2 calls Sub3, say which variables are visible in Sub3. (c) Assuming that dynamic scoping is used and the calling sequence is Main calls Sub2; Sub2 calls Sub3; Sub3 calls Subl, say which variables are visible in Subl. (d) Assuming that dynamic scoping is used and the calling sequence is Main calls Sub2; Sub2 calls Subl, say which variables are visible in Subl