Which of the following commands will copy one disk partition /dev/sda3 to /dev/sdb3?

Which of the following commands will copy one disk partition /dev/sda3 to /dev/sdb3?
A . dd if=/dev/sdb3 of =/dev/sda3 bs=4096 conv=notrunc
B . dd if=/dev/sda3 of=/dev/sdb3 bs=4096 conv=notrunc
C . dd –input /dev/sda3 –output /dev/sdb3 bs=4096 conv=notrunc
D . dd –input /dev/sdb3 –output /dev/sda3 bs=4096 conv=notrunc

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Answer: B