根据下列程序的执行结果，可以断定划线部分的修饰符应为 【14】 。
执行结果：
i9a football is created.
a football is created.
i=10
a football is destroyed.
a football is created.
i=20
a football is destroyed.
a football is destroyed.
源程序：
# inelude＜iostream. h＞
class Footballpublic:
Football() cout＜＜"a football is created. "＜＜end1;
～Football() cout＜＜"a football is destroyed. "＜＜end1;
;
void func(int i) ______ Football f1;
Football f2;
cout＜＜"i= "＜＜i＜＜end1;void main() func(10);
func(20);