A. ON B. WITH C. FOR D. INREAD THE FOLLOWING PASSAGE AND MARK T...

37. A. on B. with C. for D. inRead the following passage and mark the letter A, B, C, or D on your answer sheet toindicate the correct answer to each of the questions As computer use becomes more common, the need for security is more common than ever.One of the greatest security threats in the online world is computer hacking. Computer hacking is the unauthorized access to a computer or network of computers.Hackers are people who illegally enter systems. They may alter or delete information, stealprivate information, or spread viruses that can damage or destroy files. But how exactly cana hacker get into a system to do these things? Most hackers use information called protocols that are built into computer software. Theseprotocols allow computer to interact with one another. Protocols are sort of like computerpolice officers. When a compute connects to another system, the protocols check to see if theaccess is valid. The protocols can also determine how much information can be sharedbetween the two systems. Hackers can manipulate the protocols to get unlimited access to acomputer system. In fact, just the act of entering a computer network is considered hacking. This is commonlycalled passive hacking. Passive hackers get a rush from just being able to access achallenging system like a bank or military network. Another kind of hacker tries to dodamage to a system. After hacking into systems, these hackers release viruses or alter,delete, or take information. Known as active hackers, they are, by far, the more dangerous ofthe two. The easiest way to protect a system is with a good password. Long and unusual passwordsare harder for hackers to guess. For even greater security, some online services now use“password-plus” systems. In this case, users first put in a password and then put in a secondcode that changes after the user accesses the site. Users either have special cards or devicesthat show them the new code to use the next time. Even if a hacker steals the password, theywon’t have the code. Or if the hacker somehow gets the code, they still don’t know hepassword.