A sample was taken of the salaries of 20 employees of a large company. The following is a boxplot of the salaries (in thousands of dollars) for this year. Based on this boxplot, which of the following statements is true?a. The interquartile range is about $20,000.b. The minimum salary is $20,000. c. The range of the salaries is about $75,000.d. The median salary is about $40,000.