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Which of the following statements are true? I. A cost driver is a factor, such as machine-hours, beds occupied, computer time, or flight-hours, that causes direct costs. II. Job-order costing systems often use allocation bases that do not reflect how jobs actually use overhead resources. III. An employee time ticket is an hourby-hour summary of the employee's activities throughout the day. Only statement I is true. Statements I and II are true. Statements II and III are true. All of the statements are true