下列程序的输出结果是______。
#include＜iostream＞
using namespace std;
class Test(
public:
Test() cnt++;
～Test() cnt--;
static int Count()return cnt;
private:
static int cnt;
;
int Test::cnt=0;
int main()

cout＜＜Test::Count()＜＜"";
Test t1,t2;
Test*pT3=new Test;
Test*pT4=new Test;
cout＜＜Test::Count()＜＜"";
delete pT4;
delete pT3;
cout＜＜Test::Count()＜＜end1;
return 0;

A．024

B．042

C．420

D．240