Final answer:
The true statement about Data Frames is that the working directory is the location from which files can be imported, and this does not change automatically on either Mac or Windows. One must manually set the working directory, with different systems potentially requiring different methods.
Step-by-step explanation:
The question pertains to the properties and manipulation of Data Frames in a programming context, likely with reference to a language like Python that uses Data Frames within the pandas library or a similar environment in R. When addressing the true statement about Data Frames, it is important to clarify that the working directory is indeed the location from which files can be imported. However, the working directory does not change automatically, whether you are using a Mac or a Windows machine. In most programming environments, you must manually set the working directory to the desired path where your data files are located. The process for changing the working directory can be slightly different between Mac and Windows due to different file system paths and potentially different commands in the terminal or console.
The correct statement is therefore: a. The working directory is the location from which I can import files. It is important to familiarize yourself with the command or method used within the specific programming language or software tool you are working with in order to effectively change the working directory as needed.