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. Some words or phrases may be used more than once. $$\begin{array} { l l l l } \text { inverse } & \text { common } & \text { composition symmetric } & \text { exponential } \\\text { vertical } & \text { logarithmic } & \text { natural half-life } & \text { horizontal }\end{array}$$
-To see whether a graph is the graph of a one-to-one function, apply the line test to see whether it is a function, and then apply the line test to see whether it is a one-to-one function.

A) horizontal; inverse
B) vertical; exponential
C) vertical; horizontal
D) horizontal; vertical