Final answer:
All methods—Azure Portal, PowerShell, Azure CLI—are valid for creating a virtual machine; the easiest depends on user preference. The Azure Portal is usually more user-friendly, while PowerShell and CLI cater to those experienced with scripting.
Step-by-step explanation:
The easiest way to create a single virtual machine can vary based on user preference and expertise. Options a) Azure Portal, b) PowerShell, and c) Azure CLI are all valid methods for creating a virtual machine in Microsoft Azure. However, for those unfamiliar with scripting or command-line tools, using the Azure Portal is generally considered the most user-friendly and intuitive option, as it provides a graphical interface and step-by-step guidance throughout the creation process.
Conversely, using PowerShell or the Azure CLI might be faster for users who are comfortable with command-line interfaces and have experience in executing scripts. These methods allow for automation and can be more efficient, especially when deploying multiple virtual machines or incorporating the process into a deployment pipeline. Therefore, the answer d) All of the above is correct; the "easiest" way depends on the user's expertise and preference.