Which of the following descriptions about Mesh routing establishment in pro-active mode is correct?

Which of the following descriptions about Mesh routing establishment in pro-active mode is correct?
A . MP periodically sends broadcast PREQ, receives MP/MPP response unicast PREP, and establishes a round-trip route between any two points
B. MPP sends broadcast RANN periodically, receives MP and sends unicast PREQ to MPP, MPP responds to PREP after receiving it, and establishes a route between MP and MPP
C. MPP periodically sends broadcast RANN, receives MP and sends unicast PREP to MPP, and establishes a route between MP and MPP
D. MPP periodically sends broadcast PREQ, the received MP responds to unicast PREP, and establishes a route between MP and MPP

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Answer: C