Using Dynamic Rate Switching (DRS), when a client must change to a lower data rate, what best defines the action?

Using Dynamic Rate Switching (DRS), when a client must change to a lower data rate, what best defines the action?
A . The client lowers the data rate by 1 Mbps each time
B . The client lowers the data rate to the lowest data rate supported each time
C . A client lowers the data rate by 5% each time
D . The client lowers the data rate to the next lowest fixed rate that should work properly based on link quality

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Answer: D