Which of the following should be considered true when selecting a 64-bit version of Windows?

Which of the following should be considered true when selecting a 64-bit version of Windows?
A. 64-bit extensions can be disabled in the bios and prevent a proper boot.
B. XP Compatibility mode only allows for the 64-bit version of Windows XP.
C. Many browser plug-ins may only be supported on 32-bit browsers.
D. 64-bit uses memory more efficiently so less RAM is needed than in a 32-bit version.

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