Which of the following statements is correct?

a. The Gramm-Leach-Bliley Act of 1999 allowed commercial banks to again participate in investment banking activities.
b. The Federal Reserve System brought the American economy a system of central banks.
c. "Wildcat banking" during the first half of the 1800s referred to risky banking practices by many state banks, such as excessive note issues, lack of adequate bank capital, and insufficient reserves against their notes and deposits.
d. All the above statements are correct.

Ans: d. All the above statements are correct.