public static int mystery(int x, int y) { if (x < 0) { return -mystery(-x, y); } else if (y < 0) { return -mystery (x, -y); } else if (x == 0 && y == 0) { return 0; } else { return 100 * mystery (x / 10, y / 10) + 10 * (x 8 10) + y % 10; } What is the value returned by method call: mystery(-7, 4) а. -74 b. -174 С. 74 d. 174

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