单选题A laser printer has a vertically repetitive print defect. Before attempting to repair the printer，a technician should determine：（）A the distance between the spots.B which paper tray was used to print the document.C which driver was used to print the do
题目
单选题
A laser printer has a vertically repetitive print defect. Before attempting to repair the printer，a technician should determine：（）
A
the distance between the spots.
B
which paper tray was used to print the document.
C
which driver was used to print the document.
D
which application was used to print the document.