$5.$ The syntax of string formatting is$?$

M

A$.$ 'GNU$\backslash \text{'}$s Not $\%$d $\%\%\text{'}\%$ 'UNIX'

B$.$ 'GNU's Not $\%$d $\%\%\text{'}\%$ 'UNIX'

VL

C$.$ GNU$\backslash \text{'}$s Not $\%$s $\%\%\text{'}\%$ 'UNIX'

D$.$ 'GNU's Not $\%$s $\%\%\text{'}\%$ 'UNIX'