Which of the following interpretations for the given expression is correct? (5y^2-7)^3/(2y)^2 a. the difference of the cube of 5 times the square of y and 7 divided by 2 times the square of y b. the cube of the difference of the square of 5 times y and 7 divided by the square of 2 times y c. the cube of the difference of 5 times the square of y and 7 divided by the square of 2 times y d. the cube of the difference of 5 times the square of y and 7 divided by 2 times the square of y