Before a skillset threshold class will apply to a skillset, which action must be taken?

The skillset threshold class must be created and assigned to the skillset in configuration.

The skillset threshold class must be created and applied to the agents servicing the skillset.

The skillset threshold class must be created and assigned to the skillset in Orchestration Designer.

The skillset threshold class must be created and assigned to the skillset in Real-Time displays.