Mercedes-Benz R&D North America, Autonomous Driving Team - No responses after I submitted my coding challenge!!!

Hi all, About two months ago, I applied to "Mercedes-Benz R&D North America (MBRDNA), Autonomous Driving Team" online. I didn't hear back from them until a month later. They sent me a coding challenge to solve. I did the challenge and I believe I aced it since it was not a hard thing. But, I haven't heard back from them since then! Nought, nil, nada, nothing, zero, zilch! Not even a rejection since usually after these challenges, you would get a rejection so fast. So, what does it mean? Should I consider it as a rejection? Thanks. @mbrdna