Haha, I'm going to go with B and D. Who needs purchase orders and service milestones when you can just create activities in your network? That's the way to do it!
I agree with Alona. B and D are the right options. Assigning a purchase order and creating a service milestone don't seem to be the way to define an external task.
B and D seem like the correct answers to me. Creating an external activity in a network and a service activity in a network are the ways to define an external task.
Brock
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