By requiring the user to use more than one finger to authenticate, you can:

A.
Provide statistical improvements in EAR.

B.
Provide statistical improvements in MTBF.

C.
Provide statistical improvements in FRR.

D.
Provide statistical improvements in ERR.

Explanation:
Statistical improvements in false rejection rates can also be achieved by requiring the user to use
more than one finger to authenticate. Such techniques are referred to as flexible verification.