Which are malicious codes?

javascript
key loggers
scrum
spyware
worms

Which of the following had the greatest influence on opening the internet to the generly public

What type of computer network ensures high security ?

Write a program that asks the user to enter the name of an input file. if the file does not exist, the program should prompt the user to enter the file name again. if the user types quit in any uppercase/lowercase combinations, then the program should exit without any further output.