Mr. Vellman has a test bank with 75 multiple-choice questions on lesson 5.7. The test bank comes with a random generator that will select and arrange questions to make different versions of a test. How many different versions of a 10-question multiple-choice test on this lesson could Mr. Vellman make? Express your answer in scientific notation. Round the first number to one decimal place. Enter the correct exponent on the "10".
a. 3.4 × 10¹¹
b. 3.4 × 10¹⁰
c. 3.4 × 10⁹
d. 3.4 × 10⁸