Final answer:
In scoping management tasks related to IT, 'Exclusion' is the option used to omit computers from a selected scope such as in network scanning or project planning.
Step-by-step explanation:
When scoping management tasks, especially in the context of computer networks or information technology projects, the option that can be added to omit computers is an Exclusion. An exclusion typically refers to the process of deliberately leaving out certain systems, devices, or components from a particular scope of work, project plan, security policy, or network configuration. It may be based on criteria such as function, security levels, or departmental needs. For example, when carrying out a network scan for vulnerabilities, an IT administrator may set exclusions for particular servers due to maintenance schedules or other reasons to ensure that those computers will not be included in the scan.