When link budgeting, the customer requires the edge coverage probability to be 50%. Which is the correct description? (Multiple choices)

When link budgeting, the customer requires the edge coverage probability to be 50%. Which is the correct description? (Multiple choices)
A . 50% of the users in the marginal area cannot make calls
B. 50% of the fringe area cannot make calls
C. 50% of the calls in the fringe area are unsuccessful
D. System shadow fading margin is 0

Answer: CD