Which of the following technologies uses multiple devices to share work?

A.
Switching

B.
Load balancing

C.
RAID

D.
VPN concentrator

Explanation:
Load balancing is a way of providing high availability by splitting the workload across multiple computers.
Incorrect Answers:
A: Switching means making use of a multiport device / not many devices to share work.
C: RAID or redundant array of independent disks (RAID). RAID allows your existing servers to have more than one hard drive so that if the main hard drive fails, the
system keeps functioning.
D: VPN concentrator is a hardware device that is used to create remote access VPNs.

Dulaney, Emmett and Chuck Eastton, CompTIA Security+ Study Guide, Sixth Edition, Sybex, Indianapolis, 2014, pp 234-235