单选题：In the following computer resources, _____ are preemptive resour

In the following computer resources, _____ are preemptive resources. @[B](1)
A. CPU, printer, main and secondary memory
B. CPU, messages, main and secondary memory
C. Interrupts, messages, information in I/O buffers
D. Interrupts, I/O channels, information in I/O buffers





A.CPU, printer, main and secondary memory
B.CPU, messages, main and secondary memory
C.Interrupts, messages, information in I/O buffers
D.Interrupts, I/O channels, information in I/O buffers


答案：B