All 64-bit editions of Windows include the WOW64 compatibility layer, which lets them execute 32-bit (x86) user-mode applications transparently. The reverse is not true-32-bit Windows lacks the ability to load or execute 64-bit code-and 32-bit drivers cannot be loaded by a 64-bit OS. Therefore, only option 1 accurately describes the relationship; the other options incorrectly claim that 32-bit Windows can run 64-bit apps, that 64-bit Windows can load 32-bit drivers, or that virtualization is required for 32-bit apps on 64-bit Windows.
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