A team has the following DockerFile that will create an image 
FROM windowsservercore 
RUN powershell.exe -Command Invoke-WebRequest "https://www.python.org/ftp/python/3.5.1/python-3.5.1.exe" -OutFile c:\python-3.5.1.exe 
RUN powershell.exe -Command Start-Process c:\python-3.5.1.exe -ArgumentList `/quiet InstallAllUsers=1 PrependPath=1` -Wait 
RUN powershell.exe -Command Remove-Item c:\python-3.5.1.exe -Force 
You need to ensure that you optimize the DockerFile. Which of the following can you do to create an optimized DockerFile?

Answer options:

A.Change the base image
B.Place an ENTRYPOINT
C.Ensure to have only one RUN command
D.Create a working directory

Answer – C 
An example of such an optimization is given in the Microsoft documentation. You can just have one RUN command in the DockerFile. 

Since this is clearly given in the documentation, all other options are incorrect 
For more information on optimizing DockerFiles, please visit the below URL 

https://docs.microsoft.com/en-us/virtualization/windowscontainers/manage-docker/optimize-windows-dockerfile