To answer this question, we need to understand the memory requirements for XFree86.
XFree86 is an open-source implementation of the X Window System, which provides the graphical user interface on Unix-like operating systems. The memory requirements for XFree86 can vary depending on factors such as the display resolution, color depth, and the number of applications running simultaneously.
The minimum memory requirements for XFree86 are typically stated in terms of RAM (Random Access Memory). In this case, the correct answer is D) 8MB, which means that a minimum of 8 megabytes of RAM is required to run XFree86.
Option A) 640K is incorrect because this memory requirement is more commonly associated with early versions of MS-DOS and is not relevant to XFree86.
Option B) 2MB is incorrect because it is lower than the actual minimum memory requirement for XFree86.
Option C) 4MB is incorrect because it is also lower than the actual minimum memory requirement for XFree86.
Option E) 16MB is incorrect because it is higher than the actual minimum memory requirement for XFree86.
Therefore, the correct answer is D) 8MB because it represents the minimum memory requirement for XFree86.