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Following data refers to the activities of a project, where, node $1$ refers to the start and node $5$ refers to the end of the project.

$\begin{array}{|l|l|} \hline \textbf{Activity} & \textbf{Duration (days)} \\ \hline 1-2  & 2 \\ \hline 2-3  & 1 \\ \hline 4-3  & 3  \\ \hline 1-4  & 3  \\ \hline 2-5  & 3 \\ \hline 3-5  & 2  \\ \hline 4-5 & 4 \\ \hline \end{array}$

The critical path (CP) in the network is

  1. $1$-$2$-$3$-$5$
  2. $1$-$4$-$3$-$5$
  3. $1$-$2$-$3$-$4$-$5$
  4. $1$-$4$-$5$
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