On the eve of the unveiling of the U.S. Department of Labor’s final version of its fiduciary rule, Americans say they favor the best-interest standard, but tend to be unaware whether they’re receiving advice from a fiduciary.

According to a recent study sponsored by Financial Engines, a Sunnyvale, Calif.-based registered investment advisor, 77 percent of Americans would support legally requiring all financial advisors to put their clients’ best interest first when providing investment advice. Most of the respondents, 93 percent, also said they felt like it is important that advisors be required to meet the standard.

However, Americans aren’t aware of which standard their advisors adhere to, 41 percent of the survey’s respondents already receiving professional advice said they weren’t sure if their advisor was a fiduciary or not, and only 18 percent of the survey’s total respondents knew what it meant for an advisor to be a fiduciary.

“Our research shows that even if people may not fully understand the intricacies of who is a fiduciary and who is not, they have a clear preference for advisors who are legally required to put their clients’ best interests first,” said Christopher Jones, chief investment officer at Financial Engines, in a written comment.

According to recent reports, U.S. Labor Secretary Thomas Perez is likely to unveil the final version of its fiduciary rule at the Center for American Progress on April 6.

Many of Financial Engines’ respondents believed that the best-interest standard already applies to financial advisors — 46 percent mistakenly believed that all advisors are required to put clients’ interests first when providing retirement investment advice.

When asked what they thought about commission-based revenue models, 55 percent of the survey’s respondents reported that they felt the commission structure was “a bad thing for me” compared with only 10 percent who said it was “a good thing for me.” According to Financial Engines, baby boomers were more likely to object to the commission model than other generations.

Sixty-three percent of the respondents not currently receiving professional advice said they would be more likely to work with an advisor if they knew that the advisor was a fiduciary.

For the study, Financial Engines surveyed 1,018 U.S. adults from Feb. 22 to Feb. 24, 2016.