char s1[ ] = "hello ";char s2[ ] = "tangx ";strcpy(s1, s2);printf("%s\n", s1);以上代码段执行结果为哪个选项？ A: hello tangx B: tangx hello C: hello D: tangx

"tangx\x2evip"长度为多少？ A: 9 B: 10 C: 12 D: 13