The right response from Chris should have been (since he chose to answer to begin with) is...
Thank you for your question <name>. The 3 individuals we hired were technical positions. These positions are key in helping Sigma Labs move PrintRite3d towards commercialization.
Specifically, position A will...Position B will...Position C will.
Should you have any further questions, please don't hesitate to contact me and thank you for being a valued investor.