A user has been instructed to use unique passwords for accessing each system. Which of the following BEST describes the potential risk of using the same password?

While some passwords might be easier to guess regardless of reuse, the act of reusing a password does not inherently make that specific password easier to guess; the risk lies in the amplified impact once it is compromised.

Using the same password across multiple systems creates a critical vulnerability because if an attacker successfully obtains that password from one system (e.g., through a data breach or phishing), they can then attempt to use the identical credentials to log into all other systems the user accesses, leading to widespread unauthorized access and compromise. This is often referred to as 'credential stuffing.'

Single sign-on (SSO) systems are designed to allow users to log in once and access multiple systems without re-entering credentials; using unique passwords on individual systems does not prevent SSO from functioning, as SSO relies on a centralized authentication mechanism.

Systems may reject passwords based on their own complexity or history requirements, but this is a separate issue from the security risk of reusing an identical password across different systems, which primarily concerns the impact of compromise.