1. Unsigned int Unsaved Changes Unsaved Changes 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? O 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() * 20