How is book value used as a comparison indicator when evaluating stock purchases?

A$.$ A stock that is over book value means the stock is underpriced and investors should buy.

B$.$ The rate of dividend payments can be determined.

C$.$ Investors can compare book value to market value to make decisions about the value of a stock.

D$.$ Book value indicates how much investors are willing to pay for a share of stock in a company.

E$.$ The Rule of $72$ can be applied to book value to determine how sound the investment is$.$