What is the strongest valid specification for the following program? Some specifications may be equally strong....

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What is the strongest valid specification for the following program? Some specifications may be equally strong. method DoobyDooby (x:int) returns (y:int) ensures [??] { } (a) (b) (c) var a := X; var b = 2*a; if a<0 {b:=-b; } y :=a+b; O (d) O (e) O if x<0 then y := -x else y := 3*x y == (y -x || y if x<0 then y == -x else y == == == 3*x -x || y == 3*X 3*x) && y >= 0 y == a+b && a==x && (b==2*a || b==-2*a) What is the strongest valid specification for the following program? Some specifications may be equally strong. method DoobyDooby (x:int) returns (y:int) ensures [??] { } (a) (b) (c) var a := X; var b = 2*a; if a<0 {b:=-b; } y :=a+b; O (d) O (e) O if x<0 then y := -x else y := 3*x y == (y -x || y if x<0 then y == -x else y == == == 3*x -x || y == 3*X 3*x) && y >= 0 y == a+b && a==x && (b==2*a || b==-2*a)

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