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What is correct about the following description of device management in the operating system?

What is correct about the following description of device management in the operating system?

A.

The main task of port device management is to complete the I/O requests made by users and classify I/O devices for users.

B.

Whenever a process makes an I/O request to the system, as long as it is secure, the device allocator will assign the device to the process according to a certain policy.

C.

Device management can virtualize a physical device into multiple logical devices through virtualization technology, providing multiple user processes to use.

D.

In order to alleviate the problem of speed mismatch between CPU and I/O devices and improve the parallelism of CPU and I/O devices, in modern operating systems, almost all I/O devices are exchanging numbers with processors

Buffers are used at all times.

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