The only one of those I would trust is the site ending with EDU I hope this helps you.
Answer:
c) ECC
Explanation:
Based on the usage that the friend will have as well as his concern of the computer crashing due to a memory error, we can say that the best type of RAM that he can purchase is ECC memory. These are regular RAM modules but come with error correcting code. This code checks data as it passes through the RAM and auto corrects it if necessary in order to avoid crashes due to memory error.
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Answer:
B . It amplifies the power to speed up the motor and generate more torque
This is a little tricky. I would say reserve. It would help to know what programming language and class this is for because a lot of times when you create an array variable the memory is put onto the stack and you as the programmer do not reserve memory space. Now on the other hand, if you are programming in C and you want to create an array variable and put it on the heap then you would reserve memory space on the heap.