单选题：9 producers and 6 consumers share one common buffer with 8 items

9 producers and 6 consumers share one common buffer with 8 items of capacity. Please choose the initial value for a semaphore to ensure mutual exclusion. @[A](1)
A. 1
B. 6
C. 8
D. 9




A.1
B.6
C.8
D.9


答案：A