Câu 50: CPP: C++ Certified Professional Programmer

What happens when you attempt to compile and run the following code?#include #include #include using namespace std;template struct Out {ostream & out;Out(ostream & o): out(o){}void operator() (const T & val ) { out v1(10);sort(t1, t1+5); sort(t2, t2+5);copy(t1,t1+5,v1.begin());copy(t2,t2+5,v1.begin()+5);merge(v1.begin(), v1.begin()+5,v1.end());for_each(v1.begin(), v1.end(), Out (cout));cout<<endl; return 0;}Program outputs:

1. A. 1 2 3 4 5 6 10 8 7 9
2. B. 3 2 4 1 5 6 7 8 9 10
3. C. 3 2 4 1 5 6 10 8 7 9
4. D. 1 2 3 4 5 6 7 8 9 10
5. E. compilation error — đáp án hiện tại