A Patent Holder Should Mark Their Product as Patented in Order

A patent holder should mark their product as patented in order to achieve the fullest protections.Each of the following is an acceptable means to mark the product except:

A) writing the word patent on the item or its packaging.
B) placing the patent number on the item or its packaging.
C) writing pat. on the item or its packaging.
D) placing a P in a circle on the item or its packaging