You use Azure’s Form Recognizer Layout API to analyze and extract the text from a set of PDF and JPG documents. You have the Azure subscription, Form Recognizer resource endpoint, key and all other input requirements are met.In the first call, you analyze the layout and in the second call you get the analyze layout results. As a result of these two operations, you get the recognized text and additional details such as bounding box and confidence. 
Given the scenario above, which value from the Analyze Layout operation will you use as input for the Get Analyze Layout Result operation?

Answer options:

A.Operation-Location
B.Result URL
C.Result ID
D.Response Header

Correct Answer: C
Option A is incorrect. The Operation-Location is a url that contains the result id value. This value is passed as query input to the Get Analyze Layout Result operation in order to get the recognized text.
Option B is incorrect because Result URL is not used as input by the Get Analyze Layout Result operation. Instead, the Result ID value is used in this operation as the input.
Option C is correct because the Result ID value, as obtained from the Operation-Location url “https://cognitiveservice/formrecognizer/v2.1/layout/analyzeResults/{resultId}” is used as a query parameter to get the recognized text using the Get Analyze Layout Result operation.
Option D is incorrect because Response Header is Operation-Location. As explained earlier, it is not the value that is used as-is by the Get Analyze Layout Result operation.
Reference:
To learn more about form recognizer layout service, use the link given below: 

https://docs.microsoft.com/en-us/azure/applied-ai-services/form-recognizer/concept-layout