Verified Answer :

k=0 because any other answer does not work, they all are not in the parentheses above. 0 plus every number is the same number, which is still above.

olemakpadu

Just by trying out the options,

K = 0, 
0 plus any of the number (6,2,1,3) still results to 6,2,1,3 which is in the set.

option (D) is the answer.

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