Final answer:
A field can be made required in three places: the Field Edit page, through Validation Rules, and on Page Layouts. These settings ensure that a field must be filled out before a record can be saved or edited.
Step-by-step explanation:
The question pertains to making a field required within a system, which is likely related to data management or a customer relationship management (CRM) platform like Salesforce. There are multiple places where a field can be set as required in such systems. Here are the correct options:
Field Edit page: You can set a field to be required at the schema level, meaning every record must have this field filled out before being saved.
Validation Rules: These are criteria that are set to ensure data entered into a record meets specific standards or rules. A validation rule can make a field required only under certain conditions or for certain records.
Page Layouts: While page layouts do not make a field required at the database level, they can control whether a field is required when a user is viewing or editing a record through a particular page layout.
Options 4 (Record Type) and 5 (Workflow Rule) do not directly provide the function to make a field required.