Consider the following recursive function:

$1.$ void func$($int n$)\{$

$2.$ if $($n $>0)\{$

$3.$ func$($n$-1)$;

$4.$ cout $<<$ "Hello"$<<$ endl;

$5.$ func$($n$-1)$;

$6.\}$

$7.\}$

$($a$)$ Number of "Hello" displayed on the screen for "func$(1)".$

$($b$)$ Number of "Hello" displayed on the screen for "func$(2)".$

$($c$)$ Number of "Hello" displayed on the screen for "func$(3)".$