Final answer:
The question seeks an equation for seek time as a function of seek distance, with potential options offered. To select an accurate equation, the characteristics of the motion involved in seek time must be considered, often leading to a square root relationship, suggesting Option D as a plausible answer.
Step-by-step explanation:
The question is asking us to write an equation for the seek time as a function of the seek distance for a computer's hard drive, where t represents the time in milliseconds, and l represents the seek distance in cylinders. To find the correct relationship, we need to refer to the nature of how seek time can be related to seek distance, which typically is linear for smaller distances but can vary for larger distances due to acceleration and deceleration phases involved in the motion of the hard drive's read/write head. Without any specific details about the physical characteristics of the drive, we cannot definitively choose the equation. However, in many cases, seek time can be roughly proportional to the square root of the seek distance due to the combination of acceleration and constant motion phases, which suggests Option D (t = √l) may be a reasonable choice if these factors are considered.