Scaling out is the process of ______.

A.
adding additional servers and implementing load balancing between them

B.
upgrading server performance by adding or upgrading server components

C.
configuring multiple servers that act as a single unit

D.
implementing network load balancing

Explanation:
The process of adding additional servers and implementing load balancing between the servers is referred to as scaling out.
Incorrect
Answers:
B: The process of adding components or upgrading existing components in a server is referred to as scaling up.
C: Configuring two or more servers to act as one is referred to as clustering.
D: Network load balancing (NLB) is a form of clustering which allows multiple servers to act as a single unit.
References:
Charles J. Brooks, Server+ Certification Exam Cram 2 (Exam SK0-002), QUE Publishing, Indianapolis, 2006, pp. 39-45.