The correct options are A site administrator will maintain and configure the field for use across projects, The field should accept only a single selectable value, and Every project needs the ability to add this field to their issue screens.

A site administrator will maintain and configure the field for use across projects is correct because custom fields are typically created and configured at the global or site level so that they can be standardized, managed centrally, and made available to many projects. Central administration ensures consistent behavior and permissions across the instance.

The field should accept only a single selectable value is correct because a custom field can be defined as a single-select field when you need one value chosen from a predefined list. That data shape is a common reason to use a custom field rather than a free text field or a multi select option.

Every project needs the ability to add this field to their issue screens is correct because custom fields that are created globally can be added to multiple projects and screens. If the intent is to let projects opt in and place the field on their own issue types and screens then a globally managed custom field is appropriate.

The assignee must be automatically set based on the chosen value is incorrect because automatic assignment is achieved with workflow post functions or automation rules rather than by the custom field itself. A custom field can carry the value but it does not by itself perform automatic assignee changes.

A project administrator will be responsible for managing the field within their project is incorrect because creation and configuration of custom fields is normally a site or system administration task. Project administrators can add existing fields to screens and schemes when permissions allow but they do not typically create global custom fields for the whole instance.

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