A family is preparing for their dinner event. The preparation requires the completion of the following activities along with their durations and immediate predecessor(s):

(Activity: A, Duration: 5, Predecessor(s): None);

(Activity: B, Duration: 2, Predecessor(s): A);

(Activity: C, Duration: 5, Predecessor(s): A);

(Activity: D, Duration: 2, Predecessor(s): B,C);

(Activity: E, Duration: 2, Predecessor(s): C);

(Activity: F, Duration: 1, Predecessor(s): D);

(Activity: G, Duration: 4,Predecessor(s): A,B,F) 1) Draw the network diagram of this dinner event preparation. 2) Find the earliest start times of all the activities. 3) What is the critical path? 4) What is the project duration?