Select the correct combination of mathematical signs that can sequentially replace the * signs and balance the equation.
25 * 7 * 40 * 20 * 4 * 210

A

$$\times, +, −, \div, =$$

B

$$\times, −, +, \div, =$$

C

$$−, +, =, \div, \times$$

D

$$+, −, =, \div, \times$$