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16. 

Backups should be done
A. daily for most installations
B. weekly for most installations
C. as several image copies, followed by an incremental
D. as several incrementals, followed by an image copy
E. None of the above
17. 

In an absolute loading scheme, which loader function is accomplished by assembler.
A. Reallocation
B. Allocation
C. Linking
D. Loading
E. None of the above
18. 

The command interpreter
A. is usually the primary user interface
B. requires fixed format commands
C. is menu drive
D. is quite different from the SCL interpreter
E. None of the above
19. 

A task in a blocked state
A. is executable
B. is running
C. must still be placed in the run queues
D. is waiting for same temporarily unavailable resources
E. None of the above
20. 

System maintenance:
A. is usually not necessary
B. is necessary on all systems, regardless of how good
C. is not required if the system is well written
D. always requires several programs
E. None of the above