A student uses his name and birth year as a password. Why is it weak?

Correct answer: It can be easily guessed from personal information

The governing concept is password security through unpredictability. A name and birth year are often available to classmates, acquaintances, or through public profiles, so attackers can try them easily. Option B is correct. A safer password should be long, unique, and difficult to predict, ideally using a mixture of character types and protected by multi-factor authentication where available. Length alone or the presence of letters does not guarantee safety.