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Explanation:

Option 2 can be inferred from, “In a modern computer, electronic and magnetic storage technologies play complementary roles.”
The passage mentions, “Most attention in the field is focused on an alternative approach based on magnetic tunnel-junctions (MTJs), which are being investigated by researchers at chip makers such as IBM, Motorola, Siemens and Hewlett-Packard.” This extract combined with “the general consensus is that MTJs are the more promising ideas.” Hence, option (c) can be inferred.
Option 4 can be inferred from, “The NRL researchers plan to commercialise their device through a company called Non-Volatile Electronics.”
The passage mentions, “Electronic memory chips are fast but volatile ...". Therefore option 1 is clearly false and cannot be inferred.
Hence, the correct answer is option 1.