You have created the following functions to convert temperatures between Kelvin and Fahrenheit and placed them in the file temp$\_$kelvin$\_$fahrenheit.py$.$

def to$\_$kelvin$($fahrenheit$)$:

kelvin $=($fahrenheit $+459\mathrm{.}67)*5/9$

return kelvin

def to$\_$fahrenheit$($kelvin$)$:

fahrenheit $=$ kelvin $*9/5-459\mathrm{.}67$

return fahrenheit

Which of the following code segments would be the best way to document the overall module?

a$.)$

$"""$ Converts temperatures between Kelvin and Fahrenheit $"""$

b$.)$

$""$ Conversions $""$

c$.)$

$""$ Converts temperatures between Kelvin and Fahrenheit $""$

d$.)$

$"$ Conversions $"$