A well-delineated, ovoid radiolucency surrounded by a smooth, dense, radiopaque rim, is located inferior to the inferior alveolar canal in the posterior mandible. What is the most likely diagnosis?

Static bone cavity.

Aneurysmal bone cyst.

Keratocystic odontogenic tumour (odontogenic keratocyst).

Unicystic ameloblastoma

Late stage odontoma.