In which thread asynctask functions will execute?

A. all four functions executes in worker thread context.
B. all four functions executes in main thread context.
C. onPreExecute, onProgressUpdate, onPostExecute - runs in background thread, doInBackGround - runs in MainThread
D. onPreExecute, onProgressUpdate, onPostExecute - runs in Main thread, doInBack
Ground - runs in background Thread

Answer: D