What is the relationship between 'Stratasys' and '3D printing' in the context of the input sentence.
Options: headquarters location, owned by, product/material produced, location of formation

Stratasys Ltd. (Nasdaq:SSYS), a leading global provider of 3D printing and additive manufacturing solutions, has today announced that Italian Service Bureau, ZARE , has halved production costs for its direct manufacturing customers in automotive and aerospace since investing in a fleet of Stratasys Fortus 3D Production Systems.
product/material produced