Which one is the correct answer? Please help thank you.

Incorrect Question 3 0/0.5 pts Given two strings str1 and str2, the correct/preferred way to check to see if the two strings are not-equal (i.e., have at least one character that is different) is: str1.compare(str2) != 0 str1 != str2 str1 = null && str1.compare(str2) != 0 O !str1.equals(str2) Incorrect Question 5 0/0.5 pts Assume the following code is used to read user inputs. std::string str; std::cin >> std::quoted(str); Assume the user enters the following input. The data that will be stored in the variable str will be: this is a test This is a test This is a test Incorrect Question 6 0/0.5 pts Assume the following code is used to read user inputs. std::string str; std::cin>> str; Assume the user enters the following input. The data that will be stored in the variable str will be: this is a test test This This is a test is a