Recommend a solution to generate a monthly report of all new Azure Resource Manager (ARM) resource deployments in the subscription. Which service should be used to collect and analyze deployment data for reporting?

Azure Log Analytics is the correct choice because it can collect and analyze logs from various Azure resources, including ARM deployments. You can configure diagnostic settings for Azure resources to send deployment logs to a Log Analytics workspace, then use Kusto Query Language (KQL) to query and filter for new deployments over a specific period, like a month, and generate reports. Azure Arc extends Azure management to on-premises and multi-cloud environments but doesn't primarily focus on collecting and analyzing deployment logs within Azure itself. Azure Monitor metrics collects numerical data about resource performance and availability, not detailed deployment logs. Azure Advisor provides recommendations for optimizing Azure resources, not a mechanism for collecting and reporting on deployment history.