Which of the following devices would MOST likely require a serial adapter to be installed on amodern PC?（）

单项选择题Which of the following broadband types can provide the MOST available bandwidth?（）

A.DSL
B.Fiber
C.Satellite
D.Cable

单项选择题A user reports that their UPS is making a loud beeping sound. Which of the following would cause this problem?（）

A. The UPS is overcharged.
B. Incorrect wattage on the power supply.
C. The UPS battery is not charged.
D. The UPS is in power management mode.