【名词&注释】
数字签名(digital signature)、因特网(internet)、防火墙、基本知识(basic knowledge)、公开密钥加密(public key encryption)、电话线(telephone line)、速度快(fast)、每个人(everyone)
[单选题]The ______ is a collection of computers connected together by phone lines allows for the global sharing of information.
A. interface
B. Internet
C. LAN
D. WWW