The correct answer is: B. Which is assigned one and only one task.
A dedicated computer is a computer that is assigned one and only one task. This means that the computer is not used for any other purpose other than the task it is assigned to. Dedicated computers are often used in industrial settings, where they are used to control machines or processes. They can also be used in scientific research, where they are used to perform complex calculations.
Option A is incorrect because a dedicated computer can be used by multiple people. Option C is incorrect because a dedicated computer can use multiple kinds of software. Option D is incorrect because a dedicated computer can be used for both application software and system software. Option E is incorrect because the correct answer is B.