Identifying the values a, b, and c is the first step in using the Quadratic Formula to find solution(s) to a quadratic equation. What are the values a, b, and c in the following quadratic equation? -6x² = −9x + 7 O a O b 0 c O'd a = 9, b = 7, c = 6 a = -9, b = 7, c=-6 a = -6, b = 9, c = -7 a = -6, b = -9, c = 7​