Questions Remaining: $3$

If String a contains $"$A$",$ String b contains $"$B$"$ and String c contains $"$C$",$ which of the follc $"$A:B:C$"$ using only the String class in Jav$$ SE$?$

String.format $("8$s:$8$s:$8$s$",a,b,c$;

$a$:$b$:$c$

String.join $("$:$",$ a$,$b$,$c$)$;

$a+$:$+b+$:$+c$

string.join $($a$,$ b$,$ c$,"$: $")$;