What does the error message "The headers or library files could not be found for JPEG, a required dependency when compiling Pillow from source" indicate?
A) The Pillow library is fully installed and working correctly.
B) The required JPEG development headers or library files are missing, which are needed to compile Pillow from source.
C) The Pillow installation is using a different image format that does not require JPEG files.
D) The error is related to a network issue, not a missing JPEG dependency.