A manager for a school with thousands of students saves a backup copy of all of the data in the student database. However, he doesn't save a copy of the database schema, because he figures the data itself is enough. A week later, a computer virus corrupts their active database, and the company needs to recreate the database from the backup files. But without the schema, the files are basically useless. Which of the following threats to digital continuity BEST describes this scenario? O It may be impossible to negotiate legal permissions needed for preservation Carriers used to store digital materials usually deteriorate within a few years or decades at most Materials are lost in disasters like fires, floods, equipment failure, viruses, or attacks Critical aspects of functionality, like formatting of documents or rules by which a database operates may be lost