Acrobat color printing problem

My mom was having trouble getting PDF documents to print in color. They kept printing in grayscale, even though the print options were configured for using color ink.

We finally figured out that it was due to the "Save ink/toner" option in the Acrobat print options, which had been selected. Unselecting that option fixed the problem, and we were able to print the PDF documents in color.

O/S: Windows 7
printer: Brother MFC-6490CW