You are stairs training a young healthy above the knee amput…

You are stairs training a young healthy above the knee amputee. According to the prosthetist, the prosthetic knee has the computer programming to allow the amputee to ascend the stairs one step at a time (step to step) and to descend the stairs reciprocally (step over step) once the client is fully trained. You know you will be working with which of the following prosthetic knees.