单项选择题 A user cannot undock a laptop from the docking station. Which of the following is the MOST likely cause?（）

单项选择题 A user is printing pictures to the color laser printer and the bottom half of the picture is faded. The printer is displaying no errors. Which of the following is the MOST likely resolution to the problem?（）

单项选择题 A user reports that the laser printer is constantly jamming on humid days. Which of the following is the MOST likely resolution to the problem?（）