A. Profile

Reasoning:

Profiles in Salesforce are a fundamental way to restrict access to objects, including custom objects. By adjusting the object-level permissions (such as Create, Read, Edit, Delete) on a profile, administrators can control which users have access to the custom object and what kind of access they have (e.g., whether they can view, edit, or delete records of that object). If a custom object is set to Public Read/Write at the organization-wide default (OWD) level, adjusting the profile settings for specific users or groups of users can restrict access further, overriding the OWD settings for those users.

A. Profile

Reasoning:

Profiles in Salesforce are a fundamental way to restrict access to objects, including custom objects. By adjusting the object-level permissions (such as Create, Read, Edit, Delete) on a profile, administrators can control which users have access to the custom object and what kind of access they have (e.g., whether they can view, edit, or delete records of that object). If a custom object is set to Public Read/Write at the organization-wide default (OWD) level, adjusting the profile settings for specific users or groups of users can restrict access further, overriding the OWD settings for those users.