Consider the following project network, with task duration data provided: START FINISH Which of the following are true statements, concerning tasks pictured in this diagram? I. Task D could be started immediately, even if no other work has been done on any other tasks. II. Task B cannot start until both tasks A and D are completed. III. Task E cannot start until both tasks D and F are completed. a. I and III Ob.I and II c. II and III d. I ll and III Oe.I only