(A) bar coding, OCR, pen, and voice recognition
(B) mouse, OCR, pen, and voice recognition
(C) keyboard, OCR, pen, and voice recognition
(D) all of the above
(A) bar coding, OCR, pen, and voice recognition
(B) mouse, OCR, pen, and voice recognition
(C) keyboard, OCR, pen, and voice recognition
(D) all of the above
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