What happens when a new task is submitted to an ExecutorService in which no threads are available?

A The executor adds the task to an internal queue and completes when there is an available thread.

B The thread submitting the task waits on the submit call until a thread is available before continuing.

C The executor stops an existing task and starts the newly submitted one.

D The executor throws an exception when the task is submitted.

E The executor discards the task without completing it$.$