Among the listed timeframes, which represents the least frequent periodic requirement?

• A. 60 minutes
• B. 2 hours
• C. Calendar year
• D. 12 calendar months

Answer: (D)

In these time-based requirements, how often you have to act depends on the length of the interval. The shorter the interval, the more often you must perform the action; the longer the interval, the less often you do it. The two long intervals are tied to a year, but a 12 calendar months window is typically treated as a rolling year window (checking the last 12 months and resetting as time moves forward), which makes its cadence effectively less frequent than a fixed calendar year that resets at year boundaries. Because it covers a full year as a continuous window, the 12 calendar months option represents the least frequent periodic requirement among the choices.