Evaluate the collective function of references cited together in a given text segment.
Classify their combined role into one of the following categories: 'method', 'background', or 'result'.

Text:…the three different components of episodic memory: registration (by ensuring that all items have been truly registered), storage (by providing the semantic cues for facilitating the access to stored information), and retrieval (by the spontaneous recall of items after delay) (Sarazin et al., 2010).
Category: