What is the output of the code shown below? s1={3, 4} s2={1, 2} s3=set() i=0 j=0 for i in s1: for j in s2: s3.add((i,j)) i+=1 j+=1 print(s3)

• A. {(3, 4), (1, 2)}
• B. Error
• C. {(4, 2), (3, 1), (4, 1), (5, 2)}
• D. {(3, 1), (4, 2)}