Which sequence of events correctly describes the mechanism of a carrier protein in facilitated diffusion?

Carrier protein forms a tunnel, solute passes through, carrier returns to original shape.

Solute diffuses through lipid bilayer, carrier protein assists in movement.

Solute binds to carrier protein, carrier undergoes conformational change, solute is released on the other side of the membrane.

Carrier protein uses ATP, solute binds, solute is transported across the membrane.