Various tricks can increase the credibility of paintings and other artwork. These tricks include the following: a. an item may be introduced to the public at the home of a well-known collector b. an item may be introduced to the public in the window of a ritzy store c. an item may also go through a small auction house d. an item may be passed through some pseudo sales among collaborating dealers before arriving in an upscale art mart e. all of the above A device used by Hans Van Meegeren and other art fraudsters to bring forgeries to market is a. to exploit a time gap in an artists record of productivity often indicated by an incomplete catalogues raisonnes b. to forge documents that indicate the provenance of a fake work or art object to make it seem real c. to master the style of the painter involved and use the same kind of pigments and other materials as the artist d. all of the above e. a and c The threat of art forgeries has waxed and waned over the years but it presents a greater threat to commerce a. when a larger number of paintings by masters come to the market in a relatively short period of time b. the art market becomes infused with streams of capital invested by less sophisticated buyers with a newfound interest in art c. when art buyers spend less money on establishing the provenance and value of artworks d. when the global economy is in a recession e. none of the above The presence of forgeries is a drag on the art economy by: a. defrauding consumers b. threatening integrity and trust in the marketplace c. decreasing the value of authentic art which is limited in supply d. all of the above e. a and b