WLAN is increasingly popular because it enables cost-effective（）among people and applications that were not possible in the past.

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答案解析

翻译：无线局域网（WLAN）日益流行起来了，因为它可以在用户、应用和数据之间建立有效的连接，而这一切在过去是无法实现或无法有效实现的。A．连线 B．循环 C．连接 D．接口

WLAN is increasingly popular because it enables cost-effective（ ）among people and applications that were not possible in the past.