Which structural feature accurately describes a triglyceride molecule?

A carbohydrate backbone with three mono-unsaturated side chains that always confer liquid state at room temperature regardless of chain length.

A glycerol backbone esterified to three fatty acids, where chain length and saturation of those fatty acids influence physical properties like melting point.

A three‑ringed sterol core attached to three phosphate groups that determine the molecule's amphipathic character and membrane roles.

Two glycerol molecules linked head-to-head with a single very long polyunsaturated fatty acid bridging them to make an amphiphilic bilayer-forming lipid.