You are tasked with improving the sentiment analysis model for your company's social media page to ensure it remains accurate and up-to-date. The model processes real-time data from Pub/Sub using Dataflow for predictions. After each training iteration, the latest two versions of the model are kept live, with a traffic split favoring the newest version at an 80:20 ratio. Given the constraints of minimizing management overhead and ensuring seamless model updates, which of the following solutions is the BEST for managing this pipeline efficiently? Choose the correct option.