In the context of ankle fractures, what does the term 'bimalleolar equivalent' refer to?

A Fracture of both the medial and lateral malleolus B Fracture of the lateral malleolus with deltoid ligament tear C Fracture of the medial malleolus with anterior inferior tibiofibular ligament tear D Fracture of the medial malleolus with posterior malleolus fracture