Given the following code, which variable$($s$)$ is$/$are assured to be set to true?

String $s1=$ "Hello $"$;

s$1+=$ "World";

String $$2=$ "Hello";

$52+=$ ;

$52+=$ World;

String $s3=s1.$ intern$()$;

String $$4=$$$2.$ intern$()$;

boolean $b1=s3==s4$;

boolean b$2=$ s$3.$equals$($s$4)$;

Pick ONE option

Both $b1$ and b$2$

b$1$

b$2$

Neither b$1$ or b$2$