What does the following Python function do$?$

I$\%$ is the mod operator. $//$ is integer division, i$.$e$.$ division, followed by floor. For example, $7\%3$ evaluates to $1,7//3$ evaluates to $2.$ Put differently, both functions execute the division algorithm; $//$ finds the quotient, $\%$ the remainder. def function$($b$,$n$,$d$)$ defines a function with inputs bin and d$.]$

def funation $($b$,$n$,$ d$)$ :

result $-1$

while n $>0$:

$15$n$82=1$:

result $-$ result$*$b& d

n$=$n$-1$

n $=$ n $112$

return result

$$It returns b$\text{'}$ mod d using fast modular exponentiation

$$It returns the lowest common prime factor of b$,$ n and d$.$

$$It executes the division algorithm n$=$bd$+$r and returns the value of r $("$result$")$

$$It executes the division algorithm d$-$b$+$r and returns the value r $($result

$$It return Ic$($b$,$ n$,$ d$)$