Offset bits tell us how many bytes of data are in a block. these bits are the right-most bits of the memory address. you can consider this as the number of columns of data in a cache. with a specific value of the offset bits from an address, we know which column of a block we are trying to access. given the block size of a cache is 16b (bytes), how many bits do we need for offset? what is the number of bits in offset as a function of block size? is it practical to have a cache of block size = 1 byte?