The correct option is 5 * * * *.

5 * * * * sets the minute field to five and leaves the hour day month and weekday fields as wildcards so the function runs at five minutes past every hour on every day of the week. In standard cron notation the first field is minutes and that is why this expression matches minute five of every hour.

0/5 * * * * is incorrect because it means every five minutes starting at minute zero so it fires at 0, 5, 10 and so on each hour rather than only at five minutes past the hour.

5 * * * 1-5 is incorrect because the trailing 1-5 restricts the schedule to weekdays only and the question requires every day of the week.

0 5 * * * is incorrect because it schedules minute zero of hour five each day so it runs once daily at 5 AM rather than at five minutes after every hour.

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