You are tasked to detect faces from a group of individuals. The PersonGroups that you created contain PersistedFace objects of all individuals. You plan to use the recognition models of the Face service in Azure. To compare the accuracy of the models and choose the best model for the intended outcome, you use the parameter recognitionModel in the API call. In the first execution, you choose the default recognition model, and in another execution you use the latest available recognition model. 
<pre>string imageUrl = "&lt;image url&gt;";
var faces = await faceClient.Face.DetectWithUrlAsync(imageUrl, true, true, recognitionModel: "...................................................", returnRecognitionModel: true);
</pre>
Review the scenario above, complete the code for the first model execution by choosing the most appropriate answer choice:

Answer options:

A.recognition_04
B.recognition_01
C.recognition_03
D.recognition_02

Correct Answer: B 
Here is the completed code 
<pre>string imageUrl = "&lt;image url&gt;";
var faces = await faceClient.Face.DetectWithUrlAsync(imageUrl, true, true, recognitionModel: "recognition_01", returnRecognitionModel: true);
</pre>Option A is incorrect. The default recognition model is recognition_01.
Option B is correct. The default recognition model is recognition_01.
Option C is incorrect. The default recognition model is recognition_01.
Option D is incorrect. The default recognition model is recognition_01.
Reference:
To learn more about the face recognition models, use the link given below: 

https://docs.microsoft.com/en-us/azure/cognitive-services/face/face-api-how-to-topics/specify-recognition-model