Which of the following statements is true? Select one O a. The manual method and historical method are the two most commonly used for recording and telection from to the sales history, O b. Void Sheets are used to record the names of servers who served prepared portion of food which customers te when c. Managers of restaurants would normally strive for lower monthly inventory tumover les O d. One advantage of calculating potential savings daily rather than periodically is the timeliness of the rest