Regarding the corporate tax brackets, which of the following statements are true. a. In 2017, the highest marginal corporate tax rate is actually 39%. Cb.In 2017, personal service corporations are taxed at a flat 35%. Cc. In 2017, corporations with taxable income in excess of $335,000 are not necessarily taxed at a flat 34%. d. In 2020, C corporations will be taxed at a flat 21%. e. All of the above