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There are 4 questions about C++.

1. Unsigned int saved std::string's size method returns an unsigned integer. Assuming we have a string named my_string, what is the recommended way to determine what twice a my_string's length is? int twice = (int) my_string.size() * 2; Int twice = static_cast(my_string.size()) * 2: int twice = my_string.size() * 2; int twice = my_string.size() * 2.0; const int x = 7; auto y = &x; *y = 5; The compiler generates an error for the last line. Why? Because y's type is const int * Because y cannot be dereferenced Because x must be equal to y The compiler doesn't generate an error std::string s = "hello"; std::string * const s2 = &s; auto s3 = s2; // What is the type of s3? std::string std::string * std::string * const None of the above O int x = 7; auto y = &x; auto z = &y; 00000