Question

mj: post-processing
use the information below to answer the question.
like all 3d printing processes, there is post - processing that needs to be done. firstly,
the support structure must be removed, usually done by a third party. the support
material is dissolvable in water with an ultrasonic bath. the final post - processing step
before shipping it is to soak it in sodium hydroxide.
surface finish
sanding is optional, as it already has a good finish.
the print can be painted for additional color.
water dyes are an option to add some color to clear or translucent parts.
adding a clear coat gives it a bit more structural strength.
electroplating is also an option to put a metal coating on the project.
what is the first step of post - processing for material jetting
prints?
the print must be sanded.
the excess powder must be cleaned away.
the print must be electroplated.
the support structure must be removed.

Explanation:

The text clearly states that the first step in post - processing for Material Jetting prints is to remove the support structure. Sanding is optional, excess powder cleaning and electroplating are not mentioned as the first step in the given text.

Answer:

The support structure must be removed.