Y2K Compatibility Issues Arose Because

Y2K compatibility issues arose because:

A) Older computer systems recorded dates in mm/dd/yyyy formats and memory for these was expense.
B) Older computer systems recorded dates in mm/dd/yyyy formats and memory in older systems was unreliable.
C) Old computer systems kept dates in mm/dd/yy formats.
D) Memory in older systems would fail when challenged with a mm/dd/yy formatted date.