下列程序段执行后，x5的结果是______。 public class ex42 { public static void main(String[] args) { int xl = 8; int x2 = 12; int x3=7; int x4; int x5; x4 = x1 ＞ x2 x1 : x2+ x1; x5 = x4 ＞ x3 x4 : x3; System.out.println(x5); } }

A．11

B．20

C．10

D．12