Which of the following, if true, would illustrate why price indexes such as the CSPI might overstate inflation in the cost of going to college?a. The quality and design of calculators improved dramatically from 2017 to 2019. b. For example, calculators made in 2019 accept memory cards, whereas those made in 2017 do not, but this quality change is hard to measure. c. As the price of textbooks increased, more and more students turned to the used-book market or chose not to buy textbooks at all, instead using the copies on reserve in the library. d. Professors required each student to buy 10 textbooks, regardless of the price. e. A new, safe method of memory enhancement became available for purchase.