'.JPG' extension refers usually to what kind of file?
Answer: Option B
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What does AM mean?
Answer: Option D
Amplitude modulation was the first type to be used in radio. It works well with HF and morse code.
In what year was the "@" chosen for its use in e-mail addresses?
Answer: Option A
'.TXT' extension refers usually to what kind of file?
What was the first ARPANET message?
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