A$.$ Study the code given below and answer the questions that follow:

function $xb=$ incsearch $($func$,x$ min, xmax,$ns)$

if nargin error$(\text{'}$at least $3$ arguments required'$),$ end

if nargin ; end

$x=$ linspace $($xmin$,x$ max, ns$)$;

$f=$ func $(x)$;

$nb=0$;$xb=[]$;

for $k=1$ : length $(x)-1$

if sign$(f(k))=$sign$(f(k+1))$

$nb=nb+1$;

$xb(nb,1)=x(k)$;

$xb(nb,2)=x(k+1)$;

end

end

if isempty $($xb$)$

disp$(\text{'}$no brackets found'$)$

disp$(\text{'}$check interval or increase ns$\text{'})$

else

disp$(\text{'}$number of brackets:$\text{'})$

disp $($nb$)$

end

What does this function do$?$

Look up the MATLAB function nargin. What value is returned by nargin if the following function called is made?what value of ns was utilized in the function call above?What does k represent? Check lines $7,8,10,$ and $11.$What function syntax can be used to pass func to incsearch?For each iteration, what is the size of xb $?$