A line of research which is trying to build a magnetic chip that can both store and manipulate information, is being pursued by
Explanation:
The passage mentions, “In a paper published last month in Science, Russell Cowburn and Mark Welland at Cambridge University outlined research that could form the basis of a magnetic microprocessor- a chip capable of manipulating (rather than merely storing) information magnetically.” None of these researches have been mentioned in the options. Hence, the correct answer is option 4.
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