The correct answer is: B. Which is assigned one and only one task.
A dedicated computer is a computer that is assigned to one and only one task. This means that it is not used for any other purpose, such as browsing the internet or playing games. Dedicated computers are often used for tasks that require a lot of processing power, such as scientific research or video editing.
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 is not necessarily meant for application software. Option E is incorrect because the correct answer is B.