Select the correct combination of mathematical signs to replace the * signs and to balance the given equation.
2 * 7 * 3 * 21 * 2 * 23

A

$$\times, -, +, =, \times$$

B

$$\times, \times, -, +, =$$

C

$$\times, \times, =, +, -$$

D

$$+, +, +, = , +$$