Which option allows you to create filters that cannot be changed by the user?

The option that allows you to create filters that cannot be changed by the user is the access_filter. This type of filter is used to restrict the data that users can access based on their attributes or roles. When an access_filter is applied to a model or view, it enforces that the specified condition must always be met, thereby preventing any user from overriding or modifying this filter in their queries or explores.

The access_filter is particularly useful for scenarios where data security and user permissions are paramount, as it ensures that users can only see data that they are authorized to access according to predefined rules.

The other options refer to different functionalities within Looker. For instance, always_filter can be used to apply a filter automatically in explores but does not necessarily prevent users from altering it. Conditionally_filter is meant for creating filters based on certain conditions, which may still allow user modifications. default_value sets a default value for a filter but does not restrict user interaction. These distinctions clarify why access_filter is the appropriate choice for creating unchangeable filters.