Explanation:

Explanation:
Identify the road signs and generate a short description of each road sign: Azure AI Vision is the most suitable choice for this task. It is designed for image analysis and can accurately detect and describe objects such as road signs in large datasets like your 100,000 images. This service is optimized for computer vision tasks and helps minimize costs by efficiently processing images at scale.
Analyze the descriptions to generate a report about the different types of road signs and how often each type occurred: Azure OpenAI GPT-4-Turbo is ideal for this action. It can process natural language descriptions, identify patterns, and generate a detailed report based on the frequency of different road sign types. This model is cost-effective for text analysis tasks and can handle the volume of data derived from the image descriptions while providing advanced language understanding.