A Plus Hardware Certification Question: Download A + (Plus) Hardware PDF

Which is LEAST likely to interfere with upgrading to a newer DOS Version?
A. ROM BIOS
B. Video controller
C. Compressed drives
D. Existing backup files
E. None of the above

Option B
Video controller

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What are the basic expansion card types?	Resistance is measured: A. in parallel B. in series C. after breaking the circuit D. after checking voltage E. after checking current