Which line$($s$)$ immediately flush the output buffer?

$1$ System.out.print$("$One for the money"$)$;

$2$ System.out.print$("$Two for the show

$")$;

$3$ System.out.println$("$Three to get ready"$)$;

$4$ System.out.print$("$And four to go$")$;

$5$ System.out.flush$()$;

Question $4$ options:

line $5$ only

lines $3$ and $5$

lines $2,3$ and $5$

every line