A technician needs to troubleshoot a user's computer. The user leaves personal credentials written on a piece of paper for the technician. Which of the following principles has the user violated?

Password confidentiality refers to the practice of keeping one's password a secret and protected from unauthorized access or disclosure. Writing down and leaving credentials visible, especially for someone else, directly compromises this principle by making the password easily discoverable.

Password complexity relates to the strength of the password itself (e.g., length, character types), not how it is stored or shared.

Password reuse refers to using the same password for multiple accounts, which is a different security concern than how a single password is handled.

Password expiration dictates how long a password is valid before it must be changed, unrelated to the act of writing it down.