Classify the function as linear or quadratic and identify the quadratic, linear, and constant terms. f(x) = (3x + 2)(−6x − 3)A) quadratic function; quadratic term: 6x^2; linear term: 24x; constant term: −6B) linear function; linear term: −21x; constant term: −6C) quadratic function; quadratic term: −18x^2; linear term: −21x; constant term: −6D) linear function; linear term: −18x^2; constant term: −6