The correct answer is D because it describes the Azure portal workflow for creating a forensic-style snapshot of the OS disk while preserving the source in a read-only state. Microsoft's Azure documentation explains that a snapshot can be created from a managed disk, and choosing a read-only style is the appropriate preservation-oriented approach for evidentiary handling. Option C is incomplete because it skips the important configuration details that define the snapshot properly, including naming, snapshot characteristics, and storage selection. Option B uses Azure CLI rather than the Azure portal, while the question explicitly asks for the portal-based sequence. Option A adds unnecessary and potentially misleading steps that are not part of the basic snapshot creation task. CHFI v11 includes cloud forensics, Azure evidence acquisition, and VM snapshot acquisition using Azure Portal and PowerShell, so candidates are expected to identify the correct, defensible preservation workflow. Since the scenario focuses on portal-based preservation of a compromised VM's OS disk, the sequence that includes creating a read-only snapshot from the disk in the portal is the best answer.