Find All Numbers for Which the Rational Expression Is Undefined $\frac{x^2 - x - 12}{2x^2 - 5x - 12}$

Find all numbers for which the rational expression is undefined: $\frac{x^2 - x - 12}{2x^2 - 5x - 12}$

A) {-3,4}
B) {4}
C) {-3/2}
D) {-3/2,4}