OE plugs. Copper or ?
 

Hi All
What are the original factory plugs?
Copper
Platinum
Iridium
im not too bothered about longevity as the plugs appear to be fairly easy to get to.
Recommendations would be appreciated.
2005 s40 2.4i

Update: -

bought and installed Autolite platinum plugs AP5325, on special at pepboys for $$2.54 each. The old plugs were Volvo plugs so they could possibly be original, 13 yrs old 82000 miles, or perhaps the plugs were changed at a Volvo dealer.

New plugs are working fine, the engine might be a little smoother with the new plugs.