Password combined with pin used as an authentication requirement is an example of:

Which boolean operator enables you to exclude a search term? a} not b} and c} or d} plus

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.

How can you make your column headings stand out?