Full Idea
The three main options for the ontological status of concepts are to identify them with mental representations, or with abilities, or with Fregean senses.
Gist of Idea
Concepts are either representations, or abilities, or Fregean senses
Source
E Margolis/S Laurence (Concepts [2009], 1)
Book Reference
'Stanford Online Encyclopaedia of Philosophy', ed/tr. Stanford University [plato.stanford.edu], p.2