单选题 One of the basic rules of computer security is to change your()regularly.
A、 name
B、 computer
C、 device
D、 password
单选题 ()is a device that converts images to digital format.
A、 Copier
B、 Printer
C、 Scanner
D、 Display
单选题 ()infected computer may lose its data.
A、 File
B、 Data base
C、 Virus
D、 Program