What script parameter should be used if the field value needs to be managed by the admin only?

Using the company parameter is appropriate when the field value needs to be managed exclusively by the administrator. This parameter allows for control at the company level, meaning that only users with the required permissions, usually administrators, can modify or access this specific field value. This ensures a level of security and oversight for critical business data, allowing administrative staff to regulate the settings or values that are vital for the organization's operations.

The other parameters do not provide the same level of administrative control. For example, a field parameter typically defines characteristics for fields on a record but doesn't restrict access to admin users specifically. The user role parameter, while it relates to permissions, is often used to control access at a user-role level rather than limiting it to administration. Similarly, the record type parameter pertains to the definition of what a record is or how it functions within the system, rather than controlling administrative access to specific field values. Thus, the company parameter is the most suitable choice for ensuring that only admin users can manage certain field values.