Which of the following is a part of the system unit ?
Which of the following is a part of the system unit ?
		A. CPU 
B. Monitor
C. CD-ROM
D. Floppy disk
		A. CPU 
B. Monitor
C. CD-ROM
D. Floppy disk
		A. IBM
B. Motorola
C. AMD
D. Intel 
		A. Input
B. Scanning
C. Software
D. Output 
		A. types of messages exchanged
B. message format, syntax and semantics
C. rules for when and how processes send and respond to messages
D. all of these 
		A. port 
B. pipe
C. node
D. none of these
		A. Memory cell 
B. Chip
C. Gate
D. Integrated circuit
		A. Icon
B. Screen
C. Keys 
D. Menu