The correct answer is B. A hacker is a person who has unauthorized access to data using a computer. Hackers can be motivated by a variety of factors, including curiosity, a desire to learn, or a desire to cause harm. They may use their skills to gain access to sensitive information, such as financial data or intellectual property. They may also use their skills to disrupt computer systems or networks.
Option A is incorrect because a hacker is not a person who sells goods on roadside pavement or streets. A person who sells goods on roadside pavement or streets is called a street vendor.
Option C is incorrect because a hacker is not a person who sells only online computers. A person who sells only online computers is called an online computer retailer.
Option D is incorrect because a hacker is not a person who records the telephonic conversation. A person who records the telephonic conversation is called a wiretapper.