in c$++$ programmingWhich option represents a legal invocation of the function square$()?$

string square$($int a$)$

$\{$

return $("$Commencing$")$;

$\}$

Question $10$ options:

int a $=$ square$(4)$;

string a $=$ square$("$help$")$;

double a $=$ square$(4\mathrm{.}0)$;

string a $=$ square$(4)$;