Final answer:
The correct method to access the RAM diagnostic on a Windows operating system is through the Windows Memory Diagnostic tool, not through the system properties. The properties display system information, but for RAM diagnostics, the dedicated tool needs to be run separately.
Step-by-step explanation:
The question is asking for the correct RAM diagnostic tool that can be accessed on a Windows operating system by following the steps: clicking the Start button, then clicking on Computer, and selecting Properties. This particular pathway does not lead directly to a diagnostic tool; instead, it brings up the system properties window which displays general information about the computer's system settings and hardware configurations.
To run a RAM diagnostic tool on Windows, you would typically use the Windows Memory Diagnostic tool. This can be accessed by typing 'Windows Memory Diagnostic' into the start menu search box and selecting it. It's important to note that this tool will require a system reboot and will run before the operating system starts during the next system boot.