4. Below is the table which includes the information of a new project of ABC Inc. Table 1 Normal Activity Predecessor Time (days) A B D E F A, C G B H E, D, G -- A B 5 7 5 10 5 9 8 Crashing Time (days) 1 1 1 2 1 2 1 1 Crashing Cost/day $200 $500 $200 $300 $400 $650 $500 $350 Please answer the following questions: (1) Draw the network corresponding to the information of Table 1. (2) Using Table 1, please show each step of the process of crashing of this project. What is the minimum completion time for this project after crashing? What is the minimum crashing cost?