Following is a user$-$defined function in a C$++$ program:

$```$

int getSum$($int a$,$ int b$)$

$\{$

int s$=0$;

for$($int k$=$a;kb;k$++)$

s$+=$k;

return s;

$\}$

$```$

Which one of the followings is correct?

The function

returns the sum of all the integers between a and b with a and b included

displays the sum of all the numbers between $\backslash ($ a $\backslash )$ and $\backslash ($ b $\backslash )$ with $\backslash ($ a $\backslash )$ and $\backslash ($ b $\backslash )$ included

returns all the numbers between a and b with a and b included

returns the sum of the integers $\backslash ($ a $\backslash )$ and $\backslash ($ b $\backslash )$