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Which of the following statements are true regarding physiological biometrics? Select all that apply
a. In some cases, retinal patterns may change during a person's lifetime.
b. Speech detection is an effective physiological biometric form of authentication.
c. It is more difficult to imitate cognitive biometrics than physiological biometrics.
d. Biometric identifiers require specialized scanners.
e. Due to the uniqueness of fingerprints, they cannot be spoofed.
f. Windows Picture Touch is a very promising physiological biometric technology.