Final answer:
Supporting documents under the Hours of Service regulations include those related to a driver's work activities, such as hotel and fax receipts. These are required for verifying HOS records and must be kept for 6 months.
Step-by-step explanation:
Under the Hours of Service (HOS) regulations, commercial vehicle drivers' activities are tracked to ensure safety and compliance with driving and rest periods. Among the documents that need to be retained are those that corroborate a driver's HOS records. According to the Federal Motor Carrier Safety Administration (FMCSA), supporting documents include a range of materials that can verify a driver's reported duty status. This would typically include any receipts or documents generated in the ordinary course of business that can be cross-referenced with the HOS logs.
Therefore, in this case, a hotel receipt would be considered a supporting document as it could show where the driver was resting. A fax receipt may also be included if it relates to the transport of goods or the driver's movements. A movie ticket, however, is not normally associated with the driver’s work activities and would not usually be considered a supporting document. Based on these criteria, the answer would be both (a) hotel receipt and (b) fax receipt.