Question: Which of the following is not a valid lambda expression? A. (Integer j, k) -> 5 B. (p,q) -> p+q C. (Integer x, Integer y)

Which of the following is not a valid lambda expression? 

A. (Integer j, k) -> 5

B. (p,q) -> p+q

C. (Integer x, Integer y) -> x*y

D. (left,right) -> {return "null";}

E. All of these are valid.

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