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The precedence relations and duration (in days) of activities of a project network are given in the table. The total float (in days) of activities $e$ and $f$ , respectively, are 

$\begin{array}{|c|c|c|} \hline \textbf{Activity} & \textbf{Predecessors} & \textbf{Duration (days)} \\ \hline  a  & – & 2 \\ \hline b & – & 4 \\ \hline c & a & 2 \\ \hline d & b  & 3 \\ \hline e & c & 2 \\ \hline f & c & 4 \\ \hline g & d,e & 5 \\ \hline \end{array}$

  1. $0$ and $4$
  2. $1$ and $4$
  3. $2$ and $3$
  4. $3$ and $1$
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