If 'x' means '+', '+' means 'x', '-' means '÷' and '÷' means '-', then which of the following equation is correct?

A

$$12-3\times4=12$$

B

$$44+4-2=88$$

C

$$49\times7-14=\frac{98}{2}$$

D

$$5+2-4=\frac{13}{2}$$