A machine shifts each digit by +3 (9 wraps to 2 i.e. +3 mod 10).
Input: 3 7 9 1
Output: ?

Question

Accepted Answer

(A) 6 0 2 4. Explanation: 3+3=6, 7+3=10→0, 9+3=12→2, 1+3=4. Output: 6 0 2 4.