Based on the following table below, resolve the following project cases:

a. Make a network model in the form of Activity and Arrow (AoA) and Activity on Node (AoN) for a company's product marketing project activities using the CPM method (manual and optimization software)!

b. Critical path analysis and critical time duration for the company's project!

\begin{tabular}{|c|l|c|c|} \hline Activity & \multicolumn{1}{|c|}{ Description } & Predecessor & Duration (day) \\ \hline A & Production Planning & - & 20 \\ \hline B & MarketSurveyandMarketResearch & - & 22 \\ \hline C & Production Analysis & A & 30 \\ \hline D & Modeling Product & A, B & 33 \\ \hline E & Sales Brochures & A, B & 23 \\ \hline F & Cost Analysis & C, E & 35 \\ \hline G & Product Experiment & D, E & 44 \\ \hline H & Sales Training & B, E & 31 \\ \hline I & Cost Pricing & H & 28 \\ \hline J & Project Report & F, G, I & 52 \\ \hline \end{tabular} \begin{tabular}{|c|l|c|c|} \hline Activity & \multicolumn{1}{|c|}{ Description } & Predecessor & Duration (day) \\ \hline A & Production Planning & - & 20 \\ \hline B & MarketSurveyandMarketResearch & - & 22 \\ \hline C & Production Analysis & A & 30 \\ \hline D & Modeling Product & A, B & 33 \\ \hline E & Sales Brochures & A, B & 23 \\ \hline F & Cost Analysis & C, E & 35 \\ \hline G & Product Experiment & D, E & 44 \\ \hline H & Sales Training & B, E & 31 \\ \hline I & Cost Pricing & H & 28 \\ \hline J & Project Report & F, G, I & 52 \\ \hline \end{tabular}