Which of the following dos NOT provide high availability?

A.
clustering

B.
fault tolerance

C.
scaling up

D.
scaling out

Explanation:
High availability is the ability of a server system to remain functioning despite a software or hardware failure. This can be accomplished through scaling out, clustering and fault tolerance. However, scaling up is the process of adding or upgrading components on a server and provides improved server performance but does not provide high availability.
Incorrect Answers:
A, B, D: High availability is the ability of a server system to remain functioning despite a software or hardware failure. This can be accomplished through scaling out, clustering and fault tolerance.
References:
Charles J. Brooks, Server+ Certification Exam Cram 2 (Exam SK0-002), QUE Publishing, Indianapolis, 2006, pp. 40-54.