The correct answer is B. Devicehigh=.
The Devicehigh= command is used to load device drivers and TSRs into upper memory blocks (UMBs). UMBs are unused areas of memory above 640 kilobytes (KB) that can be used to load device drivers and TSRs, which can free up conventional memory for other programs.
To use the Devicehigh= command, you must first create an UMB file. You can do this by using the MEMMAKER utility or by editing the CONFIG.SYS file. Once you have created an UMB file, you can load device drivers and TSRs into it by using the Devicehigh= command.
For example, to load the ANSI.SYS device driver into an UMB, you would add the following line to your CONFIG.SYS file:
devicehigh=ansi.sys
To load the CGA.SYS device driver and the DISPLAY.SYS device driver into UMBs, you would add the following lines to your CONFIG.SYS file:
devicehigh=cga.sys
devicehigh=display.sys
You can also use the Devicehigh= command to load TSRs into UMBs. For example, to load the QEMM386 TSR into an UMB, you would add the following line to your CONFIG.SYS file:
devicehigh=qemm386.exe
The Devicehigh= command is a powerful tool that can be used to free up conventional memory for other programs. However, it is important to use the command carefully, as loading too many device drivers and TSRs into UMBs can cause problems.
The other options are incorrect because they do not allow device drivers and TSRs to be loaded into upper memory blocks.
- Option A, DOS=High, is used to load the DOS kernel into upper memory.
- Option C, Loadhigh=, is used to load a program into upper memory.
- Option D, DOS=UMB, is not a valid command.
- Option E, None of the above, is also incorrect.