单项选择题 Which of the following describes the 25 or 9 pin connector with male pins on the back of a laptop computer?（）

单项选择题 A technician notices that there is a second partition on the primary hard drive. This partitionis notassigned a drive letter and is not accessible from Windows. Which of the following is the MOST likely explanation for this extra partition?（）

多项选择题 Which of the following commands verifies connectivity between two hosts?（）