Quiz: Computer Forensics (General)

user warning: Unknown column 'time_left' in 'field list' query: SELECT time_left FROM quiz_node_results WHERE result_id = 1566 in /home/whereisy/public_html/modules/quiz/quiz.module on line 2032.
Resuming a previous quiz in-progress.
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What is the difference between unused space and unallocated space?