Recommend a solution to produce a monthly report of all new Azure Resource Manager (ARM) resource deployments in your subscription. Which Azure service should be used to collect and query deployment activity for this report?

Azure Log Analytics is the correct choice because it is designed to collect, index, and query log data from various Azure resources, including ARM deployment activities. You can configure diagnostic settings for your subscriptions to send ARM deployment logs to a Log Analytics workspace. From there, you can use Kusto Query Language (KQL) to filter and summarize deployment events to generate your monthly report. Azure Arc extends Azure management to on-premises and multi-cloud environments but doesn't primarily focus on collecting Azure resource deployment logs. Azure Analysis Services is an analytical data engine used for complex data modeling and reporting, not for raw log collection and querying. Azure Monitor action groups are used for notification and automation based on alerts, not for data collection or querying historical logs.