Enthuware

The question is quite confusing especially when you don't see number of answers.
It asks:

Which of the following options avoids a deadlock?

And third option formally avoids deadlock:

The second thread should call getLocks() only after first thread exits out of it.
This is not necessary. Option 2 works just fine.

Should I expect such questions from Oracle regarding concurrency?

1. Our simulator does show the number of correct answer (as does the real exam). Not sure why you are not seeing that. May be you are using a customized test where Show Number of Correct Answers option is unchecked.
2. The "should" in option 3 has now been changed to "must" to make it clear.

thanks for the feedback!