Which of the following is a more expensive form of authentication? (Choose all that

apply)

A.
Miscellaneous characters

B.
Fingerprint IDs

C.
A phrase

D.
Retinal scans

Explanation:
To use the fingerprint IDs and the retinal scans is more expensive than the other forms of authentication, because it is the expenses of the software involved.
Incorrect Answers:
A, C: Passwords are less sophisticated and less expensive than alternate forms.
References:
Charles J. Brooks, Server+ Certification Exam Cram 2 (Exam SK0-002), QUE Publishing, Indianapolis, 2006, p. 464.