A technician is building a new PC with a modern 64-bit (x64) processor. The client states that a critical legacy application will only run on a 32-bit (x86) operating system. Which of the following statements is true about this scenario?
A 64-bit OS must be installed, and the legacy application can then be run in compatibility mode.
The 32-bit OS must be run inside a virtual machine on a 64-bit host operating system.
A 32-bit OS can be installed on the PC because the 64-bit processor is backward compatible.
A 32-bit OS cannot be installed on a 64-bit processor, so a 32-bit CPU must be used instead.
Modern 64-bit (x64) processors are designed with backward compatibility for 32-bit (x86) code. This means a 32-bit operating system can be installed and run directly on a computer with a 64-bit CPU without any special hardware or emulation layers. While the 32-bit OS will run, it will not be able to take advantage of 64-bit specific features, such as addressing more than 4 GB of RAM. The other options are incorrect. A 64-bit CPU is compatible, so a different CPU is not needed. While running the OS in a virtual machine is a possible solution, it is not required for compatibility. Application compatibility mode is an OS feature that might not work for all applications, especially if the requirement is for a 32-bit OS itself.
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What does it mean for a processor to be backward compatible?
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What limitations exist when running a 32-bit OS on a 64-bit processor?
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How does a 64-bit OS differ from a 32-bit OS in terms of features and compatibility?
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CompTIA A+ 220-1101 (V14)
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