You have an Azure Active Directory (Azure AD) tenant. You need to review the Azure AD sign-in logs to investigate sign-ins that occurred in the past. For how long does Azure AD store events in the sign-in logs? 

Answer options:

A. 14 days
B. 30 days
C. 90 days
D. 365 days

B

Reference: https://docs.microsoft.com/en-us/azure/active-directory/reports-monitoring/reference-reports-data-retention#how-long-does-azure-ad-store-the-data