The best answer is D. ARO.
ARO (Annualized Rate of Occurrence) measures how often a specific incident or event is expected to happen in a single year. This is the risk analysis attribute that directly represents yearly frequency.
Why the other options are incorrect:
A). RTORecovery Time Objective is the target time to restore operations after a disruption. It does not measure incident frequency.
B). ALEAnnualized Loss Expectancy estimates the expected yearly financial loss from a risk. It is calculated using other values and reflects cost, not frequency alone.
C). SLESingle Loss Expectancy is the monetary loss expected from one occurrence of an incident. It does not represent how often the event happens.
From the SY0-701 perspective, risk calculations often use:
ALE = SLE × ARO
Since the question asks how frequently an incident is expected to happen each year, the correct answer is ARO.