QUESTION $2$

Each block of data in a computer's hard drive is addressed with a unique number. A given computer hard drive uses a binary $8$ bit number to address al $256$ data blocks. If a computer designer wants to double the number of addressable data blocks to $512,$ the MINIMUM humber of bits of the address length is:

$2$ BITs $257$ BITs $9$ BITs $$ can not $be$ determined from the data presented $18$ BITs $O{9}^2$ BITs $512$ BITs