B) the time it takes for the required sector to position itself under the read/write head.
Explanation:
In Computer science, Access time is the time it takes for the required sector to position itself under the read/write head. It is usually measured in milliseconds.
An IDF cable or intermediate distribution frame is a cable rack that interconnects and manages a MDF or main distribution frame and a collection of workstations or computer systems. The MDF is a cable rack that interconnects several IDFs to itself.