Operating System (OS)
In MS-DOS, relocatable object files and load modules have extensions

.DAS and .EXE, respectively
.COM and .OBJ, respectively
.OBJ and .COM or .EXE, respectively
.EXE and .OBJ, respectively
None of these

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Operating System (OS)
File record length

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

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