以下哪一项不是增加VLAN带来的好处？（）

A、交换机不需要再配置

B、机密数据可以得到保护

C、广播可以得到控制

The equipment required to remove an on-deck oil spill on a barge transfering oil must either be arried on board or（）.

A.on a tug standing by

B.available by contract with the shore facility

C.kept at the shoreside hose connection during transfer

D.kept in a protected shoreside location readily accessible