Which of the following drives will fit in a 3 1/2-inch slot?

A.
CD-R/RW

B.
Zip drive

C.
Hard drive

D.
Floppy drive

Explanation:
Mount the master hard drive into one of the closed 3 1/2-inch slots or caddies, using appropriately sized Phillips screws for tightening.
Incorrect
Answers:
A: 5 1/4-inch drive bay is used for the CD-R/RW
B: 5 1/4-inch caddy is used for the ZIP drive
D: 3 1/2-inch is used for the floppy drive
References:
Charles J. Brooks, Server+ Certification Exam Cram 2 (Exam SK0-002), QUE Publishing, Indianapolis, 2006, pp. 251-273.