$1.$ Draw the node network, perform the CPM calculations, mark the critical path, and complete the table below:

$\backslash$begin$\{$tabular$\}\{|$c$|$c$|$l$|$l$|$l$|$l$|$l$|$l$|\}$

$\backslash$hline Activity & Duration & IPA & ES & EF & LS & LF & TF $\backslash \backslash$

$\backslash$hline A & $4$ & $-$ & & & & & $\backslash \backslash$

$\backslash$hline B & $12$ & A & & & & & $\backslash \backslash$

$\backslash$hline C & $9$ & A & & & & & $\backslash \backslash$

$\backslash$hline D & $8$ & B & & & & & $\backslash \backslash$

$\backslash$hline E & $7$ & B$,$ C & & & & & $\backslash \backslash$

$\backslash$hline F & $8$ & C & & & & & $\backslash \backslash$

$\backslash$hline G & $3$ & D & & & & & $\backslash \backslash$

$\backslash$hline H & $5$ & D$,$ E & & & & & $\backslash \backslash$

$\backslash$hline I & $11$ & E & & & & & $\backslash \backslash$

$\backslash$hline J & $9$ & E$,$ F & & & & & $\backslash \backslash$

$\backslash$hline K & $4$ & G$,$ H$,$ I & & & & & $\backslash \backslash$

$\backslash$hline L & $3$ & H$,$ I & & & & & $\backslash \backslash$

$\backslash$hline M & $2$ & J$,$ L & & & & & $\backslash \backslash$

$\backslash$hline

$\backslash$end$\{$tabular$\}$