Final answer:
At an unattended workstation, violations could include a weak password and unauthorized access. Encrypted files are not a violation, as they protect data, while a locked screen is a correct security measure.
Step-by-step explanation:
To determine the violations at an unattended workstation, consider the security best practices and policies commonly in place. An unattended workstation should ideally have a locked screen to prevent unauthorized access. Hence, options a), b), and d) can be potential violations. A weak password could allow unauthorized users to easily access the workstation. Encrypted files are not a violation as they help protect data. A locked screen is the correct security measure, not a violation. Finally, unauthorized access is a clear violation and a significant security risk. The presence of unauthorized access would indicate that the security measures have failed or have been bypassed.