According to the passage, what is the purpose of the policies regarding travel reimbursement? a. Defining the variety of reasons that a traveler should receive reimbursement for their expenses incurred on a business trip. b. Mandating that necessary and reasonable expenses incurred by staff are exempted from other taxable income. c. Providing reimbursement guidelines for hospital expenses resulting from injuries incurred on a department mandated trip. d. Providing guidelines and processes for traveling reimbursement of expenses resulting from a business trip