Operating System (OS)
File record length

should always be fixed
should be chosen to match the data characteristics
None of these
Should always be variable
depends upon the size of the file

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Operating System (OS)
Operating system

None of these
enables the programmer to draw a flowchart
links a program with the subroutines it references
All of these
provides a layered, user-friendly interface

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Operating System (OS)
All of the following are task performed by the operating system except

Managing hardware on the computer
Controlling the access that application program has to the CPU
Performing housekeeping task like file compression and disk defragmentation
Provides an interface for user to interact with computer

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