If '?' means multiplication and '?' means division, what is the value of 12 ? 3 ? 4?

A. 9

If '+' represents multiplication, '-' represents addition, '×' represents subtraction, and '÷' represents division, what is the result of 4 ÷ 2 + 3 × 5?

B. 20

If A + B means A - B, A - B means A × B, A × B means A ÷ B, and A ÷ B means A + B, what is the value of 10 + 5?

A. 5

If '+' represents addition, '-' represents subtraction, '×' represents multiplication, and '÷' represents division, what is the value of 8 ÷ 2 × 4 + 6 - 3?

B. 17

If '>' means addition, '<' means subtraction, '=' means multiplication, and '?' means division, what is the value of 3 > 2 < 1 = 4 ? 2?

A. 12