What is called the percentage at which the False Rejection Rate equals the False Acceptance Rate? 

Answer options:

A. False Rejection Rate (FRR) or Type I Error
B. False Acceptance Rate (FAR) or Type II Error
C. Crossover Error Rate (CER)
D. Failure to enroll rate (FTE or FER)

C

The percentage at which the False Rejection Rate equals the False Acceptance Rate is called the Crossover Error Rate (CER).Another name for the CER is the Equal Error Rate (EER), any of the two terms could be used. Equal error rate or crossover error rate (EER or CER) It is the rate at which both accept and reject errors are equal.The EER is a quick way to compare the accuracy of devices with different ROC curves.In general, the device with the lowest EER is most accurate. The other choices were all wrong answers: The following are used as performance metrics for biometric systems: false accept rate or false match rate (FAR or FMR): the probability that the system incorrectly matches the input pattern to a non-matching template in the database. It measures the percent of invalid inputs which are incorrectly accepted.This is when an impostor would be accepted by the system. False reject rate or false non-match rate (FRR or FNMR): the probability that the system fails to detect a match between the input pattern and a matching template in the database. It measures the percent of valid inputs which are incorrectly rejected.This is when a valid company employee would be rejected by the system. Failure to enroll rate (FTE or FER): the rate at which attempts to create a template from an input is unsuccessful. This is most commonly caused by low quality inputs. Reference(s) used for this question: KRUTZ, Ronald L. & VINES, Russel
D., The CISSP Prep Guide: Mastering the Ten Domains of Computer Security, 2001, John Wiley & Sons, Page 38. and https://en.wikipedia.org/wiki/Biometrics