Below is a requirements list for a taxi company's booking system: REQ#1: The system must allow the operator to make and amend a taxi booking. REQ#2: The system must allow the operator to delete a taxi booking. REQ#3: The system must be available within standard working hours. REQ#4: The system should support 100 concurrent booking requests between 06:00hrs and 23:30hrs. REQ#5: The system should allow the operator to add a note when cancelling a taxi booking. The following actions are being considered: A) Separate REQ#1 into 2 requirements. B) Clarify what is meant by 'standard working hours' in REQ#3. C) Check that the proposed solution will be able to support 100 concurrent booking requests, per REQ#4. D) Separate REQ#4 into 2 requirements. E) Review and merge REQ#2 and REQ#5. Which of these actions should be undertaken to improve the clarity of these requirements?