Which statement(s) are correct regarding celluloid crown for…

Which statement(s) are correct regarding celluloid crown forms?1.  The size of the crown can be enlarged by warming the round end of an instrument and pressing it to the form.2. The size can be reduced by slitting the crown form vertically on the lingual then overlapping.3.  One or two small holes are placed in the incisal corners to vent excel materials.4.  Tooth colored cements are used for the greatest amount of retention.