What is the output of the program?

What is the output of the program?
#include #include using namespace std;
int main () { string s1 = “Hello”, s2 = “World”; s2 = s1 + s2; cout << s2; return 0; } A. It prints: Hello
B. It prints: HelloWorld
C. It prints: WorldHello
D. It prints: WorldHelloWorld

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