Sue must make estimated tax payments of $4,000 for the tax year. She makes the following payments: . Ist Payment.credit of $1,000 from her previous year refund 2nd Payment. $500 on April 20th 3rd Payment - $500 on May 31st 4th Payment - $1,000 on August 15th 5th Payment - $500 on October 15th 6th Payment - $500 on December 30th Which of the following statements is true? She has not made timely payments because her 2nd and 3rd payments were not made by April 15th She has not made timely payments because her 4th payment was not made by June 15th She has made timely estimated payments She has not made any timely payments because none of the payments were made by the required IRS schedule