What's the correct choice

What is True about the following diagram? tyet wered ied out of Order Received Flag question 41 Unprocessed Order freject] Checked (accept Checked Rejected Order Accepted Order some items not available Procesoed some items available) Processed deliver Pending Order Fulfilled Orde (al items available new supply Select one: O a. It is a state diagram b. It is not a valid UML diagram O c It is an activity diagram without decision nodes