Use the аbоve listing оf tаsks tо аnswer the following questions from the PERT diagram. A) Identify which paths are valid (in terms of the tasks in them) from start to finish via the PERT diagram. If valid, write "valid" and mention the duration for that path; if invalid, just write "invalid" i) A - D - F - G - H - I ii) B - C - E - G - H - I iii) A - E - G - H - I iv) B - C - D - G - H - I v) B - C - D - F - G - H - I B) From the list above, identify the critical path with duration