Robin Corporation, a calendar year C corporation, had taxable income of $700,000, $1.2 million, and $1 million for 2016, 2017, and 2018, respectively. Robin has taxable income of $1.8 million for 2018. The minimum 2019 estimated tax installment payments for Robin are a. April 15, 2019, $52,500; June 17, 2019, $94,500; September 16, 2019, $94,500; December 16, 2019, $94,500 b. April 15, 2019, $52,500; June 17, 2019, $52,500; September 16, 2019, $52,500; December 16, 2019, $52,500. C. April 15, 2019, $94,500; June 17, 2019, $94,500; September 16, 2019, $94,500; December 16, 2019, $94,500 d. April 15, 2019, $52,500; June 17, 2019, $136,500; September 16, 2019, $94,500; December 16, 2019, $94,500 e. None of these choices are correct. Oe