Categories in the knowledge base, by default, can be created and edited by which knowledge workers? (Choose two.)

Knowledge Authors are typically focused on writing and editing articles, not necessarily on managing the structural categories by default.

Knowledge Contributors (e.g., users with the `sn_knowledge_contributor` role) create and edit articles, and while their primary role is content creation, they interact with and influence the category structure when publishing content.

'Knowledge Controller' is not a standard default role name in ServiceNow for managing knowledge base categories.

Knowledge Managers (users with the `sn_knowledge_manager` role) have broad permissions over knowledge bases, explicitly including the ability to manage (create and edit) categories, articles, and overall knowledge base configurations.

'Knowledge Category Managers' is not a standard default role name; category management falls under broader roles like Knowledge Manager.

Knowledge Submitters are typically end-users who can only submit articles, not manage knowledge base categories.

'Knowledge Owners' is a general concept and not a specific role with default category management permissions.

'Knowledge Taxonomy Owner' is not a standard role name in ServiceNow.