b$.$ Is the company's market$-$to$-$book ratio meaningful? Is its book debt$-$equity ratio meaningful? Explain. $($Select all the choices that apply.$)$

A$.$ Because the book value of equity is positive in this case, the company's market debt$-$equity ratio may be used in comparison.

B$.$ Because the book value of equity is positive in this case, the company's market$-$to$-$book ratio and its book debt$-$equity ratio are not meaningful.

C$.$ Because the book value of equity is negative in this case, the company's market debt$-$equity ratio may be used in comparison.

D$.$ Because the book value of equity is negative in this case, the company's market$-$to$-$book ratio and its book debt$-$equity ratio are not meaningful.