Given the following two lines of code, what can be said about $s1$ and $s2?$

String $s1=$ "testing $"+"123"$;

String $32=$ new String $("$testing $123")$;

s$1$ and s$2$ are both references to the same String object.

the line declaring $s1$ is legal in Java; the line declaring $s2$ will produce a syntax error.

s$1$ variable contains same value as $s2$

s$1$ and $s2$ are references to different String objects.

None of the given options