Final answer:
Within an asynchronous task, the doInBackground() method is the one executed on the asynchronous thread, handling background processing. so, option a is the correct answer.
Step-by-step explanation:
The method executed on the asynchronous thread within a class for an asynchronous task is doInBackground(). This is a callback method that you override when using the AsyncTask framework in Android development. It is where you perform background computation that can take some time. The methods onPreExecute(), onPostExecute(), and onProgressUpdate(), on the other hand, are executed on the main UI thread.
The method executed on the asynchronous thread within a class for an asynchronous thread is doInBackground(). This method is responsible for performing background computations that will not interfere with the user interface. It is commonly used to execute tasks that may take a long time to complete, such as network requests or database operations.
The doInBackground() method is typically overridden in the class that extends the AsyncTask class. It takes the parameters specified during the creation of the asynchronous task and returns the result of the computation.