Crush washer orientation question

http://www.drizzle.com/~dantzler/images/shop/bolt1.JPG
http://www.drizzle.com/~dantzler/images/shop/bolt2.JPG
What is the correct orientation?
A) Flat part of crush washer against bolt "washer"
OR
B) Cone part of crush washer against bolt "washer"
AND Why...?
It is for an oil drain plug on a motorcycle.
Cheers - Jeff Dantzler
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