In the following code, please note the missing sections labeled $?1$ and $?2.$

function $[$dydx$]=$ examQuestion$($x$,$y$)$

L $=$ length$($x$)$;

dydx $=$ zeros$(?1,1)$;

for i $=?2$

dydx$($i$)=($y$($i$+1)-$ y$($i$))/($x$($i$+1)-$ x$($i$))$;

end

This code computes the derivative of function $$y $=$ f$($x$),$ with $$x$$ and $$y$$ as arrays of same length. Which of the following should replace the missing sections?

Group of answer choices

$?1$ should be L$-1,?2$ should be $1$:L$-1$

$?1$ should be L$,?2$ should be $1$:L

$?1$ should be L$,?2$ should be $1$:L$-1$

$?1$ should be L$-1,?2$ should be $2$:L