To answer this question, let's go through each option:
Option A) cat displays files contents. If the file is large, the contents scroll off the screen before we view it. The command 'more' is like a pager which displays the contents page by page. This option is correct because it accurately describes the differences between the 'cat' and 'more' commands.
Option B) more displays files contents. If the file is large, the contents scroll off the screen before we view it. The command 'cat' is like a pager which displays the contents page by page. This option is incorrect because it describes the commands incorrectly. The 'more' command is actually the one that displays the contents page by page.
Option C) Both will not be used to display. This option is incorrect because both 'cat' and 'more' commands are used for displaying file contents.
Option D) Both will display page by page. This option is incorrect because only the 'more' command displays file contents page by page, not the 'cat' command.
Therefore, the correct answer is A) cat displays files contents. If the file is large, the contents scroll off the screen before we view it. The command 'more' is like a pager which displays the contents page by page.