A data signal and a carrier wave are combined to form the modulated signal shown.
 

What type of modulation is depicted?

1. Amplitude modulation
2. Frequency modulation
3. Phase shift key modulation
4. Frequency shift key modulation

Which row of the table correctly identifies characteristics of analogue and digital communications?

\begin{align*}
\begin{array}{c}
\ & \\
\ & \\
\rule{0pt}{2.5ex}\textbf{A.}\\
\rule{0pt}{2.5ex}\textbf{}\\
\rule{0pt}{2.5ex}\textbf{B.}\\
\rule{0pt}{2.5ex}\textbf{}\\
\rule{0pt}{2.5ex}\textbf{C.}\\
\rule{0pt}{2.5ex}\textbf{}\\
\rule{0pt}{2.5ex}\textbf{D.}\\
\rule{0pt}{2.5ex}\textbf{}\\
\end{array}
\begin{array}{|l|l|}
\hline
\rule[-1ex]{0pt}{0pt} \quad \quad \quad \quad \quad Analogue  & \rule[-1ex]{0pt}{0pt} \quad \quad \quad \quad \quad Digital \\
\hline
\rule[-1ex]{0pt}{0pt} \text{Continuous (varying) signal} & \rule[-1ex]{0pt}{0pt} \text{Discrete (binary) signal} \\
\rule[-1ex]{0pt}{0pt} \text{Less susceptible to signal degradation} & \rule[-1ex]{0pt}{0pt} \text{More susceptible to signal degradation} \\
\hline
\rule[-1ex]{0pt}{0pt} \text{Continuous (varying) signal} & \rule[-1ex]{0pt}{0pt} \text{Discrete (binary) signal} \\
\rule[-1ex]{0pt}{0pt} \text{More susceptible to signal degradation} & \rule[-1ex]{0pt}{0pt} \text{Less susceptible to signal degradation} \\
\hline
\rule[-1ex]{0pt}{0pt} \text{Discrete (binary) signal} & \rule[-1ex]{0pt}{0pt} \text{Continuous (varying) signal} \\
\rule[-1ex]{0pt}{0pt} \text{Less susceptible to signal degradation} & \rule[-1ex]{0pt}{0pt} \text{More susceptible to signal degradation} \\
\hline
\rule[-1ex]{0pt}{0pt} \text{Discrete (binary) signal} & \rule[-1ex]{0pt}{0pt} \text{Continuous (varying) signal} \\
\rule[-1ex]{0pt}{0pt} \text{More susceptible to signal degradation} & \rule[-1ex]{0pt}{0pt} \text{Less susceptible to signal degradation} \\
\hline
\end{array}
\end{align*}