For each sentence below, identify whether they are true or false.

-When engaged as a testifying expert rather than consulting expert, the expert is not considered an agent of the attorney.

-An engagement letter for providing litigation services is required under the AICPA's professional standards.

-The determination of the risk-reward ratio of an engagement is similar among practitioners

-Under no circumstances can an expert witness provide services under a contingent fee.

-A Kovel letter should confirm that the expert is being retained to assist the attorney in providing legal services.