Uniter Enterprises wants to repurchase some outstanding shares. Which of the following methods gives them the maximum flexibility and most likely helps to support the price of the shares（）

A. Buying shares back in the open market.

B. Buying back a fixed number of shares at a fixed price.

C. Announcing a tender offer for the desired number of shares.

骨、骨胳肌和关节在运动中所起的作用相当于（　　）

A．杠杆、支点、动力

B．支点、杠杆、动力

C．动力、杠杆、支点

D．杠杆、动力、支点