What will the following command accomplish?

What will the following command accomplish?
dd if=/dev/xxx of=mbr.backup bs=512 count=1

What will the following command accomplish?
dd if=/dev/xxx of=mbr.backup bs=512 count=1

A.
Back up the master boot record

B.
Restore the master boot record

C.
Mount the master boot record on the first partition of the hard drive

D.
Restore the first 512 bytes of the first partition of the hard drive



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