While the Internet is inherently insecure, businesses still need to preserve the privacy of data as it travels over the network. To help do that, the Internet Engineering Task Force an international group of network designers, operators, vendors, and researchers concerned with the evolution of (71) has developed a suite of (72) called Internet Protocol Security (IPSec).
IPSec creates a standard platform to develop secure networks and electronic (73) between two machines. Secure tunneling via IPSec creates (74) connections in a network through which data packets can move. It creates these tunnels between remote users and within a local network. It also (75) each data packet in a new packet that contains the information neccessary to set up, maintain and tear down the tunnel when it’s no longer needed.

A．conformance

B．circuitlike

C．searching

D．secrecy

自助发卡机具有哪些功能？（）

A.自助发卡，短信通签约、查询版网银签约等功能

B.自助发卡，短信通签约、理财版网银签约等功能

C.自助发卡，短信通签约、理财版网银签约、打印对账单等功能

D.查询、转账、结售汇等功能