Most of the host operating system provides a way for a system administrator to manually configure the IP information needed by a host. Automated configuration methods, such as（）, are required to solve the problem.

A.IPSec

B.DHCP

C.PPTP

D.SOAP

分析资本主义生产过程是劳动过程和价值增值过程的统一，关键是运用______。

A．商品二因素原理
B．资本区分为不变资本和可变资本的原理
C．资本区分为固定资本和流动资本的原理
D．劳动二重性原理