Weights to be used in calculating a company’s weighted average cost of capital are least appropriately based on:（）

A. the company’s current capital structure.

B. the average capital structure weights for companies of a similar size.

C. the average capital structure weights for companies in the same industry.

在证券经纪业务的要素中，( )是指依国家法律、法规的规定，可以进行证券买卖的自然人或法人。

A．经纪商

B．委托人

C．托管商

D．代理人