Answer:
Aside from human user types, there are two other non-human user groups. Known as account types, system accounts are accounts implemented by the system for the purpose of supporting automated service, and contingent IDs are accounts that remain non-human until individuals are assigned access and can use them to recover a system following a major outage.
Step-by-step explanation:
A system account is a user account that is created by an operating system during installation and that is used for operating system defined purposes.
Contingent IDs are setup as accounts at the start of process but kept unassigned and inactive till there is any major outage in the system. After any outage, individuals are assigned access to them and they become active and used by individuals.