Which of the following statements are NOT true about the system boundaries we draw around a process before performing a mass or energy balance? Select one: a. They can be arbitrarily chosen to simplify a problem b. When doing a balance around a system boundary, we are not concerned about the processes/contents within the system boundary c. For any problem, there is one and only one correct way to choose a system boundary correct Od. System boundaries provide an imaginary boundary around a particular system of interest e. Both A and D Which of the following statements are NOT true of continuous processes? Select one: a. Raw materials are supplied throughout the process b. They can operate at steady state c. An inlet and outlet stream are required to prevent accumulation d. Once the process begins, raw material is no longer supplied e. A holding tank is often used upstream of the process to provide raw materials