Which biometric method helps to ensure that only authorized individuals gain entry?

The correct assertion here is that all of the listed biometric methods contribute to ensuring that only authorized individuals gain entry. Each of these techniques has its unique advantages and applications in the realm of access control.

Fingerprint scanning is one of the most widely used biometric technologies. It matches the unique patterns of ridges and valleys on a person's fingertip against a stored template. This method is effective in identifying individuals because no two fingerprints are alike, making it a reliable means of confirming identity.

Facial recognition technology analyzes the facial features of a person, translating this data into a mathematical representation that can be matched with stored information. This method has become increasingly prevalent due to its non-intrusiveness and efficiency, recognizing faces from various angles and under different lighting conditions.

Voice recognition operates on the unique qualities of an individual's voice, including pitch, tone, and cadence. This method is often used in scenarios where hands-free authentication is beneficial.

By utilizing any one of these biometric methods, an electronic access control system can effectively restrict entry to only those who have been authorized, enhancing security and reducing the chances of unauthorized access. Therefore, claiming that all these methods contribute to ensuring proper authentication is entirely valid.