What feature in Azure serves to reduce the attack surface for Azure resources?

Azure Bastion is a fully managed service that provides secure and seamless RDP and SSH access to virtual machines (VMs) directly through the Azure portal over SSL. This significantly reduces the attack surface for Azure resources by providing a secure jump server that eliminates the need to expose the VMs to the public internet. Instead of using public IP addresses to access the VMs, users connect through the Azure Bastion service. This means that the VMs remain isolated from direct internet exposure, thereby minimizing the risk of attacks such as port scanning or brute-force login attempts.

While the other options also serve important roles within Azure, they do not specifically focus on reducing the attack surface like Azure Bastion does. Azure Logic Apps are primarily for automating workflows, Azure Blob Storage is used for storing unstructured data, and Azure Active Directory focuses on identity and access management. None of these directly addresses the security needs related to remote access in the way that Azure Bastion does.