You plan to use Azure Speech service to convert text to speech and output it to a speaker. First you create a speech configuration and next you synthesize speech to the speaker output. Given that the prerequisites are met, Speech SDK is installed and required packages are included, review the code below and complete it by choosing the appropriate answer choices. (select two options) 
<pre class="brush:java;">static async Task SynthesizeAudioAsync()
{
var config = ……………………………..FromSubscription("&lt;subscription key&gt;","&lt;azure region&gt;");
 using var synthesizer = new …………………………...(config);
 await synthesizer.SpeakTextAsync("&lt;speaker output&gt;");
}
</pre> 

Answer options:

A.SpeechConfig
B.AudioConfig
C.AudioDataStream
D.SpeechSynthesizer

Correct Answers: A and D 
Here is the completed code snippets 
<pre class="brush:java;">static async Task SynthesizeAudioAsync()
{
var config = SpeechConfig.FromSubscription("&lt;subscription key&gt;","&lt;azure region&gt;");
 using var synthesizer = new SpeechSynthesizer(config);
 await synthesizer.SpeakTextAsync("&lt;speaker output&gt;");
}
</pre>Option A is correct because SpeechConfig provides the key and associated azure region details that is one of the ways to initialize SpeechConfig. The other options are to use an authorization token, pass a host address or pass a Speech service endpoint.
Option B is incorrect because the AudioConfig object is used to contain information when the output is intended to a file. 
Option C is incorrect because the AudioDataStream object is used when output is intended to an in memory data stream.
Option D is correct because the SpeechSynthesizer method executes speech to text and output to the speaker. You may also output to a file or as an in memory stream using the SpeechSynthesizer method.
Reference:
To learn more about text to speech output, use the link given below: 

https://docs.microsoft.com/en-us/azure/cognitive-services/speech-service/get-started-text-to-speech?tabs=script%2Cwindowsinstall&pivots=programming-language-csharp