Which code segment could be used to properly implement a custom module called temp$\_$kelvin$\_$celsius.py to convert temperatures between Kelvin and Celsius scales?

In file temp$\_$kelvin$\_$celsius.py place

$"""$ Converts temperatures between Kelvin and Celsius"""

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

$"""$ Accepts degrees Celsius

Returns degrees Kelvin $"""$

kelvin $=$ celsius $-273\mathrm{.}15$

return kelvin

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

$"""$ Accepts degrees Kelvin

Returns degrees Celsius $"""$

celsius $=$ kelvin $+273\mathrm{.}15$

return celsius

In file temp$\_$kelvin$\_$celsius.py place

$"""$ Converts temperatures between Kelvin and Celsius"""

def to$\_$kelvin:

$"""$ Accepts degrees Celsius

Returns degrees Kelvin $"""$

kelvin $=$ celsius $-273\mathrm{.}15$

return kelvin

def to$\_$celsius:

$"""$ Accepts degrees Kelvin

Returns degrees Celsius $"""$

celsius $=$ kelvin $+273\mathrm{.}15$

return celsius

In file temperature.py place

$"""$ Converts temperatures between Kelvin and Celsius"""

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

$"""$ Accepts degrees Celsius

Returns degrees Kelvin $"""$

kelvin $=$ celsius $-273\mathrm{.}15$

return kelvin

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

$"""$ Accepts degrees Kelvin

Returns degrees Celsius $"""$

celsius $=$ kelvin $+273\mathrm{.}15$

return celsius

In file temperature.py place

$""""$ Converts temperatures between Kelvin and Celsius""""

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

kelvin $=$ celsius $-273\mathrm{.}15$

return kelvin

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

celsius $=$ kelvin $+273\mathrm{.}15$

return celsius