Which of the following is not an output device ?

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Q: 99 (MPPSC/2009)

Which of the following is not an output device ?

question_subject: 

Science

question_exam: 

MPPSC

stats: 

0,11,22,11,8,3,11

keywords: 

{'output device': [0, 0, 1, 0], 'crt monitor': [0, 0, 1, 0], 'drum pen plotter': [0, 0, 1, 0], 'earphones': [0, 0, 1, 0], 'digital camera': [0, 0, 1, 1]}