In addition to fingerprint scanning, which of the following can be used in the biometric identification of a person? 1. Iris scanning 2. Retinal scanning 3. Voice recognition Select the correct answer using the code given below.

Option (D) is correct because iris scanning, retinal scanning, and voice recognition are all established biometric modalities that utilize unique physiological or behavioral characteristics to verify an individual's identity. Options like (a) or (c) are common pitfalls for those who mistakenly believe biometrics are limited to ocular or physical traits, overlooking that behavioral markers like voice are also unique and measurable. The core concept being tested is the application of biometric technology and the identification of various biological markers used for authentication.