# How to customize the question label used by \Question in the exercise package

How can I customize the question label used by \Question in the exercise package?

I'm using the exercise package. I want to customize it such that the enumeration generated by \Question uses letters ((a), (b), ...) rather than numbers (1. 2. ...).

In particular, this code

\documentclass{article}

\begin{document}

\begin{Exercise}
\Question qwer
\Question asdf
\end{Exercise}

\end{document}


produces the output

I would like to have

(a) qwer
(b) asdf


I suspect that setting QuestionHeaderNB will do the trick, but I haven't found how.

I didn't find anything related to that type of customisation in the exercise package documentation, but the following works:

\documentclass{article}