Explanation:
Binary and denary
A number base indicates how many digits are available within a numerical system. Denary is known as base 10 because there are ten choices of digits between 0 and 9. For binary numbers there are only two possible digits available: 0 or 1. The binary system is also known as base 2.
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Answer: D. He did not create a back up of his data.
Explanation: He lost his data, so he did not back it up in case he lost his laptop.
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