NVIDIA Triton Inference Server is the most suitable software component for an AI model deployment pipeline requiring frequent updates, minimal downtime, version control, and monitoring. Triton supports dynamic model loading, allowing updates without restarting the server, ensuring minimal downtime. It provides version control through model repositories (e.g., multiple model versions in a file system) and integrates with monitoring tools like Prometheus for real-time metrics. This aligns with production-grade AI deployment needs, as detailed in NVIDIA's "Triton Inference Server Documentation." NGC Catalog (A) is a model and container repository, not a deployment tool. TensorRT (B) optimizes inference but lacks deployment management features. DIGITS (D) is a training tool, not for production deployment. Triton is NVIDIA's recommended solution for these requirements.