What does "the gem of late 20th century technology” refer to

A．They made today's technology work efficiently.
B．They smooth the way for the popularity of today's technology.
C．They made the Internet a global network.
D．They overcame national and international bureaucratic obstacles.

A．both develop from the most advanced science of their time
B．they are operated similarly in technical terms
C．both help to change the way we do business and communicate
D．both facilitate the communication between cultures and ethnic groups