单选题：The per-process open-file table is ____.
The per-process open-file table is ____.@[B](1)
A. unique and maintained by OS for all users
B. one of OS data structure for better performance of file system management
C. claimed by each process and for its own purpose
D. an accounting data structure to tell how many files opened by the process
A.unique and maintained by OS for all users
B.one of OS data structure for better performance of file system management
C.claimed by each process and for its own purpose
D.an accounting data structure to tell how many files opened by the process
答案：B
A. unique and maintained by OS for all users
B. one of OS data structure for better performance of file system management
C. claimed by each process and for its own purpose
D. an accounting data structure to tell how many files opened by the process
A.unique and maintained by OS for all users
B.one of OS data structure for better performance of file system management
C.claimed by each process and for its own purpose
D.an accounting data structure to tell how many files opened by the process
答案：B