An Artisan's Lien

An artisan's lien:

A) is ineffective against other creditors unless a proper financing statement has been filed.
B) may be given priority even over perfected security interests in collateral if the artisan has possession of the goods.
C) is invalid if the artisan did not inform the debtor,before beginning the work,that he intended to claim a lien.
D) gives a retailer prevalence over someone who buys the collateral from the debtor if the buyer gives value for goods.