单选题Which benefit does digital subscriber line (DSL) systems for broadband access provide to the user?（）ADedicated lines for high security data transferBData and audio signals that share the same communications infrastructureCSecure access to company extranetDSimple solution for high-quality digital video using coaxial cable
单选题
Which benefit does digital subscriber line (DSL) systems for broadband access provide to the user?（）
A
Dedicated lines for high security data transfer
B
Data and audio signals that share the same communications infrastructure
C
Secure access to company extranet
D
Simple solution for high-quality digital video using coaxial cable
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