A host-based IDS is resident on which of the following?

A.
On each of the critical hosts

B.
decentralized hosts

C.
central hosts

D.
bastion hosts

Explanation:
A host-based IDS (HIDS) is installed on individual workstations and/or servers to watch for inappropriate or
anomalous activity.
Incorrect Answers:
B, C: A host-based IDS (HIDS) only monitors the workstations and/or servers it is installed on.
D: A Bastion host is a special purpose computer on a network designed and configured specifically to resist
attacks.

Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, 2013, p. 256
https://en.wikipedia.org/wiki/Bastion_host