单项选择题
A user is trying to connect a mobile IR printer to a mobile device with no success. Which of the following is the MOST important when printing to an IR printer?（）
A. Enough light
B. Line of sight
C. Correct printer drivers
D. Enough power
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A. The printer needs to be power cycled to clear the job.
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C. The printer needs to be set to factory defaults.
D. The user’s workstation needs to be rebooted. -
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