The correct answer is Azure AI Document Intelligence Read model.

The Azure AI Document Intelligence Read model is the prebuilt document OCR capability that extracts printed and handwritten text while preserving page and line layout. It supports multi page PDF inputs and returns text with layout information and confidence scores so automated processing and indexing are straightforward.

Azure AI Vision Image Analysis is focused on general image understanding and single image scenarios. It can perform OCR on images but it is not the prebuilt, document oriented OCR that is optimized for multi page PDFs and complex document layouts.

Custom model in Azure AI Document Intelligence requires collecting labeled examples and training to extract specific fields or structures. That approach is useful when you need repeated, structured field extraction from known forms, but it is not necessary for simple raw text extraction from a scanned PDF because the prebuilt Azure AI Document Intelligence Read model already provides OCR and layout output out of the box.

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