Which of the following is not part of a device controller? (A) Data Register (B) RAM (C) Control Register (D) Status register (E) DMA controller

(B) RAM is not part of a device controller.

Here's why:

(A) Data Register: This is part of a device controller. It is used to hold the data being transferred.

(B) RAM: This is not part of a device controller. RAM (Random Access Memory) is a type of computer memory that can be accessed randomly.

(C) Control Register: This is part of a device controller. It is used to control the operation of the device.

(D) Status register: This is part of a device controller. It is used to provide information about the status of the device.

(E) DMA controller: This is part of a device controller. DMA (Direct Memory Access) controller allows certain hardware subsystems to access system memory for reading and writing independently of the central processing unit.