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Which of the following commands overwrites the bootloader located on /dev/sda without overwriting the partition table or any data following it?

A. dd if=/dev/zero of=/dev/sda bs=512

B. dd if=/dev/zero of=/dev/sda bs=512 count=1

C. dd if=/dev/zero of=/dev/sda bs=440 count=1

D. dd if=/dev/zero of=/dev/sda bs=440

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