Q19,p3,d14. Consider the following statements S1, S2 and S3 :

S1 : In call-by-value, anything that is passed into a functi

on call is unchanged in the caller’s scope when the function returns.

S2 : In call-by-reference, a function receives implicit refer ence to a variable used as

argument.

S3 : In call-by-reference, caller is unable to see the modified variable used as argument.

(A) S3 and S2 are true. (B) S3 and S1 are true.

(C) S2 and S1 are true. (D) S1, S2, S3 are true.

 Answer C.