The correct answer is At five minutes past every hour of every day.

The expression uses six space separated fields where the first field is seconds and the second field is minutes. With 0 in the seconds field and 5 in the minutes field the trigger fires at second 0 of minute 5 of every hour. The remaining fields are wildcards so it runs every hour of every day.

Every five minutes throughout each hour is incorrect because that meaning would require a step value such as */5 in the minutes or seconds field and not a literal 5 in the minute position.

Once daily at five in the morning is incorrect because that schedule would set the hour field to 5 and typically set minutes to 0. The given expression sets minutes to 5 and leaves the hour as a wildcard so it fires every hour instead of once per day.

The schedule string is invalid so the function will not run is incorrect because many timer implementations accept six field cron expressions that include seconds and this string follows that valid format.

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