C++ Which of the following statements can make the reference named x refer to object b?

std::string a{"Apple"}; std::string b{"Banana"}; std::string & X = a; // Option 1 x b; // Option 2 &b; X = // Option 3 x.assign(b); // Option 4 X = *b; // Option 5 b; *x Option 1 O Option 2 Option 3 Option 4 Option 5 None of the above