Question: QUESTION 3 In the figure below, the source A is using the tree shown in red, to send a multicast to the destinations B, C,

QUESTION 3 In the figure below, the source A is using the tree shown in red, to send a multicast to the destinations B, C, and D. Let's call this tree the "multicast tree". Chose the best answer. 1. Which of the router(s) can be safely removed from the multicast tree R5 and R7 2. Which of the routers cannot be removed from the multicast tree R2 3. Let's assume the multicast tree is created using a center-based approach. Which routers do not need to send a join message to the tree center? A: source R1 R4 B R2 R5 R3 R6 R7 D
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