What defines a strong password?

A strong password is defined as one that is complex, unique, and difficult to guess. This means it should include a combination of uppercase and lowercase letters, numbers, and special characters. The uniqueness of the password is crucial, as using a distinct password for each account helps to prevent unauthorized access in case one of the accounts is compromised. Complexity adds to the difficulty of guessing the password through methods such as brute force attacks or social engineering tactics. A strong password is also not based on easily obtainable information, such as birthdates or names, making it significantly harder for attackers to crack.

While other options might provide some form of password protection, they fall short of the necessary criteria that constitute a strong password, making B the best choice. A password that is easily remembered may lack complexity, while common words and simple patterns can easily be predicted or hacked.