国务院期货监督管理机构、期货交易所、期货保证金安全存管监控机构和期货保证金存管银行等相关单位的工作人员，应当忠于职守，依法办事，公正廉洁，保守国家秘密和有关当事人的（），不得利用职务便利牟取不正当的利益。

A.商业秘密

B.历史记录

C.个人隐私

D.合法权益

We have already covered the topic of network addresses. The first  (1) in a block (in classes A, B, and C) defines the network address. In classes A, B, and C,if the hostid is all ls,the address is called a direct broadcast address. It is used by a(2) to send a packet to all hosts in a specific network. All hosts will accept a packet having this type of destination address. Note that this address can be used only as a (3) address in an IP packet. Note also that this special address also reduces the number of available hostid for each netid in classes A,B，and C． In classes A, B, and C, an address with all ls for the netid and hostid (32bits) define a (4) address in the current network.A host that wants to send a message to every other host can use this address as a destination address in an IP packet. However, a router will block a packet having this type of address to confine the broadcasting to the (5) network. Note that this address belongs to class E.

空白（5）处应选择（）

A.neighbor

B.next

C.remote

D.local