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?