\item
Let $\phi$ be a formula in CNF and $A$ an assignment of variables in $\phi$.
Mark the following statements that are true.

\begin{enumerate}
    \item[$\square$] A clause is \emph{satisfied} by $A$, if all variables are satisfied under $A$.
    \item[$\square$] If a clause is \textit{conflicting} under an assignment $A$, if all its variables are not satisfied under $A$.
    \item[$\square$] If a clause is \textit{conflicting} with an assignment $A$, all variables in the clause are given the opposite value in A.
    \item[$\square$] By the expression `$\phi[A]$' we denote that a variable within $\phi$ is satisfied under $A$.
\end{enumerate}
