单选题：A computer system has a device with n mutually exclusive instanc

A computer system has a device with n mutually exclusive instances. Three concurrent processes require 3,4 and 5 instances. To ensure deadlock not to occur, what is the minimum number n?@[B](1)
A. 9
B. 10
C. 11
D. 12




A.9
B.10
C.11
D.12


答案：B