$\begin{array}
\text {a.}\text{ Amplitude} & \text{1. Changes with Modulation} \\
\text {b. Carrier Frequency} & \text{2. Constant with Modulation} \\
\text {c. Value of Modulation Index} & \text {3. Can be greater than 1}\\
\text {} & \text {4. Cannot be greater than 1}
\end{array}$
