It can be either a or b.. I suggest go with b
The design of the software is covered by copy right unless it is open sourced or is a very common interface. They would need to come up with their own design and way of solving the problem to have a solution that was not copyrighted.
<span>the basic unit for storing data in exel
is </span><span>The intersection point between a column and a row is a small rectangular box known as a cell. A cell is the basic unit for storing data in the spreadsheet. Because an Excel spreadsheet contains thousands of these cells, each is given a cell reference or address to identify it.</span>