What is an example of a cognitive password?

A cognitive password relies on knowledge that is personal and memorable to the user. This type of password is often easier for the individual to remember, as it typically involves information that is significant or relatable to them personally.

Using "your mother's maiden name" as an example makes sense because this information is unique to the user and is not generally known by others. Many systems and security questions ask for this type of personal information since it is part of an individual's identity and can help in verifying their identity.

In contrast, the other choices do not exhibit the characteristics of a cognitive password. A current phone number is subject to change and may not be memorable in the same way. A random sequence of numbers is intentionally designed to be difficult to guess and remember. A single word password might not be secure enough as it lacks the complexity typically recommended for strong passwords. Thus, the selection of a personal piece of information, like a mother's maiden name, aligns well with the nature of cognitive passwords, making it the correct answer.