I would think the answer is C. Hope this helps! :D
Answer:
Following are the solution to the given points:
Explanation:
The Memory address value = 64 bit
The Size of the word 
In point a:
The offset size
( in 1-word block size)
The Index size
(as block number =512)
Tag size
In point b:
The offset size
The Index size 
Tag size 
In point c:
The Ratio at point a

The Ratio at point b

Answer:
Call microsoft
Explanation:
Exel Is My Worst Nightmare Just Call Microsoft "I'd Hope They'd Have A Answer For That"
IP Address, that is a unique address used to identify devices in a network