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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220-701

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?（）