Which option describes "field-level security" in Splunk?

Field-level security in Splunk specifically refers to the ability to restrict access to certain fields within an event. This means that even if a user has access to a particular dataset or event type, they may not necessarily have the ability to view all the fields contained in those events. This feature is crucial for maintaining a necessary level of data privacy and security, particularly in environments where sensitive information might be present within certain fields, and access needs to be carefully managed.

By implementing field-level security, an organization can ensure that only authorized users can view specific pieces of information, based on their roles and permissions. This capability is particularly useful for regulatory compliance and protecting confidential data while still allowing users to work with other, less sensitive information within the same dataset.

The other options do not accurately describe the concept of field-level security. They pertain either to user-level permissions, data organization, or security at the data source level, none of which align with the specific function of managing access to individual fields within data events.