which two lines set up things so that the libraries with console..., Input and Output, C++

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Question:Which two lines set up things so that the libraries with console input and output facilities are available to the c++ program?

A #include <iostream>
using namespace std; 
B #include <conio.h>
using namespace std; 
C #include <stdio.h>
using namespace std; 
D #include <iostream.h>
using namespace std;

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Question:Which two lines set up things so that the libraries with console input and output facilities are available to the c++ program?

A #include <iostream> using namespace std;

B #include <conio.h> using namespace std;

C #include <stdio.h> using namespace std;

D #include <iostream.h> using namespace std;

A