Which of the following is an example of an employee engaging in an intentional threat to information security?

An employee misses a training class on a new work process because of illness and as a result continues to use the old work process which results in some lost sales.

The IT department creates a data entry procedure manual that inadvertently includes a procedural error which, if followed, will result in the deletion of customer data.

A programmer codes a backdoor in the timeclock program she is developing for her company so she can later access the program to adjust her clock$-$in and clock$-$out times.

An HR manager searches the Internet for information on trends in hiring practices and downloads a PDF that contains a virus which turns her work computer into a bot.