What is considered the MOST important type of error to avoid for a biometric access control system?

A.
Type I Error

B.
Type II Error

C.
Combined Error Rate

D.
Crossover Error Rate

Explanation:
A Type II Error occurs when the system accepts impostors who should be rejected. This type of error is the
most dangerous type, and therefore the most important to avoid.
Incorrect Answers:
A: A Type I Error is when a biometric system rejects an authorized individual. It is not as dangerous as a Type II
Error, and therefore not the most important to avoid.
C: Combined Error Rate is not a valid type of biometric error.
D: The crossover error rate (CER) is a percentage that signifies the point at which the false rejection rate
equals the false acceptance rate. It is the most important measurement when determining the system’s
accuracy.

Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, 2013, p. 188