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\item \lect Consider a formula $\varphi$ in propositional logic. In the
following list, tick all statements that are true.
\begin{itemize}
\item[$\square$] If $\varphi$ is not satisfiable, $\neg \varphi$
is valid.
\item[$\square$] If $\varphi$ is valid, $\neg \varphi$ is not
valid.
\item[$\square$] If $\varphi$ is valid, $\neg \varphi$ is not
satisfiable.
\item[$\square$] If $\varphi$ is not valid, $\neg \varphi$ is
satisfiable.
\end{itemize}