What will be the value of variable $c$ at the end of this script?

clear

clf

close all

clc

$a=1$;

$b=2$;

if $a=b$

if $a>b$

$c=b-a$;

end

if $c=a-b-3-1a$

$c=a-b$;

end

end

$3$

$1$

$-3$

$-1$