A scientist has been backing up her research data to the same hard disk drive for several years. The drive is made by a well reputed and popular brand, and later versions of the drive are still commonly sold in stores. One day, the drive simply fails to start up. She wonders if perhaps it was unwise to leave the hard drive sitting in a sunny spot, or if the hard drive simply failed due to age. Which of the following threats to digital continuity BEST describes this scenario? It may be impossible to negotiate legal permissions needed for preservation Digital materials may be well preserved but so poorly described that users cannot find them O Critical aspects of functionality, like formatting of documents or rules by which a database operates, may be lost Carriers used to store digital materials usually deteriorate within a few years or decades at most