Which Azure service should you use to produce a monthly report that lists all new Azure Resource Manager (ARM) resource deployments in a subscription?

Azure Log Analytics is the correct choice because it's a service within Azure Monitor that collects and analyzes telemetry data from various sources, including Azure activity logs. You can query this data using Kusto Query Language (KQL) to filter for resource deployment events and then schedule these queries to run monthly, producing the desired report. Azure Arc extends Azure management to on-premises, multi-cloud, and edge environments, but it doesn't primarily focus on reporting Azure resource deployments. Application Insights is for monitoring the performance and usage of live web applications, not for reporting on ARM deployments. Azure Monitor action groups are used to trigger actions (like sending notifications) based on alerts, not for generating scheduled reports of past events.