Which of the Following Is a Similarity Between Attorney-Client Privilege

Which of the following is a similarity between attorney-client privilege and work product doctrine?

A) Both allow lawyers to prepare for litigation but with the risk that their work will be revealed to court adversaries.
B) Both are intended to encourage individuals involved in legal disputes to be candid with their attorneys, thus enabling the attorneys to give sound legal advice.
C) Both can be extended to non-attorneys who assist attorneys in rendering legal advice or services.
D) Both provide protection from discovery of documents and other items prepared by an attorney in anticipation of a trial.