You have been tasked with preventing unwanted removal of a webcam. Which of the following tools should you implement?

Implementing a USB lock is an effective solution for preventing unwanted removal of a webcam. A USB lock physically secures the USB connection of the webcam to the system, making it difficult for unauthorized users to disconnect the device. This physical restriction minimizes the risk of tampering or removal, which is particularly important in environments where security is a concern.

The other options serve different purposes. A smart card is typically used for secure authentication and access control, not for physically securing devices. A USB fingerprint scanner, while enhancing security through biometric identification, does not prevent the physical removal of a USB device. A privacy filter works to obscure the visual display of screens to protect confidential information from onlookers but does not address the issue of physical device security. Therefore, in the context of physically securing a webcam, a USB lock is the most suitable choice.