There are many parameters that could be used to describe disk performance; among them are:

number of bits per track	disk capacity (in bits)	number of disk surfaces
rotational speed	rotational latency	transfer rate
tracks per surface	sectors per track	blocks per track
sectors per block	seek time	speed of disk arm
block-read time	number of blocks

Some of these parameters are independent, and others are (approximately) linearly related. That is, doubling one doubles the other. Decide which of these parameters are linearly related. Then, select from the list below, the relationship that is true, to within a close approximation.

Note: none of the statements may be true exactly, but one will always be much closer to the truth than the other three. Also note: you should assume all dimensions and parameters of the disk are unchanged except for the ones mentioned.

a)	If you double the number of tracks per surface, then you double the average seek time.

b)	If you double the number of sectors on a track, then you double the capacity of the disk.

c)	If you double the number of disk surfaces, then you double the capacity of the disk.

d)	If you double the number of sectors per block, then you halve the capacity of the disk.