Given string str$1$ and string str$2,$ which expression is true?

str$1="$Hi$"$;

str$2=$ "Hello";

Given string str$1$ and string str$2,$ which expression is true?

str$1="$Hi$"$;

str$2=$ "Hello";

str$1<$ str$2$

str$1>$ str$2$

str$1<=$ str$2$

$($Comparison not possible$)$