The author holds that the “rather ugly but beneficial rectangle of plastic” has proved to be a “handy technological slave” in
Explanation:
Options 1,2 and 3, while true in themselves do not address the question stem as convincingly as option 4. The passage mentions, “... the tape recorder serves as a handy technological slave and preserves, from oblivion, the vanishing, elusive moment of oral transmission.” This resonates perfectly with option 4. Hence, the correct answer is option 4.
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