When did the major quantitative and qualitative leap occur？A.When work PCs were connecte

When did the major quantitative and qualitative leap occur？

A.When work PCs were connected to each other via Local Area Networks (LANs).

B.When work PCs were connected to each other via Internet.

C.When people showed their interest in work PCs.

D.When more and more businessmen noticed the potential market for work PCs.

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