Which of the following utilities could be used to determine a subnet mask？（）

A.Check the printers error log， and then inform the primary user what the issue is.
B.Go directly to the printer and investigate any issues that are found.
C.Investigate the printers status， then ask the primary user to write down what they think is wrong.
D.Gather information from the primary user， and then evaluate the printers condition.

A.Writing
B.Fusing
C.Development
D.Transfer

A.Clean the scanner glass on the distant machine.
B.Clean the scanner glass on the local machine.
C.Clean the printer head on the local machine.
D.Call the telephone company to increase the line signal level.