When link budget, the customer requires an edge coverage probability of 50%, which of the following description about the meaning is correct? (Multiple choice)

When link budget, the customer requires an edge coverage probability of 50%, which of the following description about the meaning is correct? (Multiple choice)
A . 50% of users in the edge area cannot make calls
B . 50% of the edge area can not call
C . 50% of calls in the edge area are unsuccessful
D . System shadow fading margin is 0

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Answer: C D