The 3D printing pioneers Stratasys Ltd. ( SSYS ) and 3D Systems Corp. ( DDD ) touched highs of $120.36 and $80.13 in 2014 and 2013 respectively.
Refer to the input text as context and select the correct relationship between '3D Systems' and '3D printing' from the available options.
Options: industry, location of formation, position held, distribution format