Possible Duplicate:
Should I use singular or plural nouns in a domain name and why?

Dear folks, two scenarios where file names should be best representing the search volume by audiences searching for it.

Scenario 1
website.org/en/logo.php
website.org/en/brochure.php
website.org/en/poster.php
website.org/en/design.php

OR

Scenario 2
website.org/en/logos.php
website.org/en/brochures.php
website.org/en/posters.php
website.org/en/designs.php

Q1. What do you intuitivly think would be the best?
Q2. What do the facts in general show? people search for singular or plural in search?
Q3. Do Search engines have common rule of thumb for this?
Q4. Should I pick either and go with either scenario consistently or does it depend on the word?

Thanks very much for your ideas/suggestions. I reall don't know which one to go for.