The MOST effective biometric control system is the one:

A.
which has the highest equal-error rate (EER).

B.
which has the lowest EER.

C.
for which the false-rejection rate (FRR) is equal to the false-acceptance rate (FAR).

D.
for which the FRR is equal to the failure-to-enroll rate (FER).

Explanation:
The equal-error rate (EER) of a biometric system denotes the percent at which the false-acceptance rate (FAR)
is equal to the false-rejection rate (FRR). The biometric that has the lowest EER is the most effective. The
biometric that has the highest EER is the most ineffective. For any biometric, there will be a measure at which
the FRR will be equal to the FAR. This is the EER. FER is an aggregate measure of FRR.