Which definition most accurately describes an electrolyte in physiological terms?

An electrolyte is any organic molecule that increases osmotic pressure in plasma and is metabolized by cells to produce ATP, often acting as a signaling hormone in endocrine pathways of the body.

An electrolyte is a type of lipid-soluble vitamin that dissolves in cell membranes and participates in long-term storage of energy and fat-soluble signaling functions.

An electrolyte refers only to proteins in the plasma that buffer pH and has no relationship to simple inorganic ions or the transmission of electrical signals in nerve or muscle.

An electrolyte is a mineral that dissociates into charged ions when dissolved in water and thereby can carry electrical current across biological fluids and across cell membranes.