In 1984, it is so difficult for Winston to meet the girl because everyone is constantly monitored.
There is no such thing as "privacy," and it is difficult to meet in a way that won't get them in trouble. They have to make elaborate plans to avoid detection so that they won't get caught.
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It means that the bridge is what holds up everything you do
The correct answer, as I see in the text, is 2 and 4 because we see in the claim that encryption began to be necessary in the informational Age, and that governments of the countries can develop this encryption to protect its people.