In SAP Service Cloud Version 2, once a case type is active, it cannot be directly modified. The only way to change an active case type is to perform the Create New Version action. This action creates a new version of the case type, allowing administrators to make changes while preserving the original. According to SAP documentation, "To modify an active case type, you must create a new version using the Create New Version action, as direct changes to active case types are not permitted." It is not possible to change an existing case type (A) is incorrect, as creating a new version is allowed. Using the Draft status (B) applies to new case types, not active ones. Copying an existing case type (C) creates a separate case type, not a modification of the active one.
Reference:
SAP Help Portal: Case Type Configuration in SAP Service Cloud V2
SAP Learning: Managing Case Types