You are a desktop administrator responsible for migrating Windows Vista computers to Windows 8.1 64-bit.
Each computer has a 20GB hard drive, 800MHz (x64) processor, and 512 MB of system memory.
You need to upgrade the computers so they can run Windows 8.1 64-bit.
Which two actions should you perform? (Each correct answer presents part of the solution. Choose two.)

A.
Add a processor that is 1 Ghz or faster.

B.
Upgrade system memory to 2 GB.

C.
Increase the hard drive size to 50 GB.

D.
Upgrade system memory to 1 GB.

Explanation:
http://windows.microsoft.com/en-us/windows-8/system-requirements
System requirements
Windows 8.1
If you want to run Windows 8.1 on your PC, here’s what it takes:
Processor: 1 gigahertz (GHz) or faster with support for PAE, NX, and SSE2 (more info)
RAM: 1 gigabyte (GB) (32-bit) or 2 GB (64-bit)
Hard disk space: 16 GB (32-bit) or 20 GB (64-bit)
Graphics card: Microsoft DirectX 9 graphics device with WDDM driver
Personal comment:
At first I thought this question was wrong, because I had no knowledge of any x64 bit processor at
800MHz. But here it is:
http://en.wikipedia.org/wiki/List_of_Intel_microprocessors#64-bit_processors:_IA-64
Itanium
Code name Mercer
Family 7
Released May 29, 2001
733 MHz and 800 MHz
2MB cache
All recalled and replaced by Itanium 2