Disk defragmentation is also referred to as ________ for short

________ can be categorized as white-hat, gray-hat, or black-hat

Fill in the blank(s) with correct word

A mixed cell reference

A) contains both an absolute and a relative cell reference. B) causes a potential error. C) contains absolute or relative cell references, but not both. D) occurs when a formula directly or indirectly refers to the cell containing the formula.