What allows an attacker to access multiple bank accounts using the same password?

The correct choice highlights the critical issue of poor password management, specifically the practice of reusing the same password across multiple sites. When individuals use the same password for different online accounts, an attacker who obtains that password through any means—such as phishing or data breaches—can gain access to all accounts that share it. This is particularly risky for sensitive accounts like bank accounts, where the potential for financial loss is significant.

When users create accounts with various services, they often create an easily memorable password and reuse it for convenience. If a hacker compromises a less secure website where that password is used, they can then attempt to use it on more secure platforms, like banking sites. This practice of password reuse creates a domino effect, making multiple accounts vulnerable once a single password is exposed.

While weak network security, insufficient password length, and unsecured email accounts all contribute to security vulnerabilities, they do not specifically address the issue of multiple accounts being compromised due to the reuse of passwords. Strong password management strategies would involve using unique passwords for every account and employing password managers to store and generate complex passwords, thus mitigating the risks associated with password reuse.