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

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

Answer: C

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