Fill in the Blank with One of the Words or Phrases

Multiple Choice

Fill in the blank with one of the words or phrases listed below. Not all choices will be used and some choices may be
used more than once. $$\begin{array} { l l l l } \text { factoring } & \text { quadratic equation } & \text { perfect square trinomial } & 0 \\\text { greatest common factor } & \text { hypotenuse } & \text { sum of two cubes } & 1 \\\text { difference of two cubes } & \text { difference of two squares } & \text { triangle } & \text { leg }\end{array}$$
-By the zero factor property, if the product of two numbers is 0, then at least one of the numbers must be ________

A) 0
B) greatest common factor
C) quadratic equation
D) 1