What is the best protection mechanism for backward compatibility of 802.11n devices with 802.11b devices?

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In your company’s WLAN, you expect to have a mixed client PHY environment and plan to use protection mechanisms. The protection mechanism used by your client devices is configurable.

What is the best protection mechanism for backward compatibility of 802.11n devices with 802.11b devices?
A . WMM Protection
B . SMPS
C . CTS-to-Self
D . Dual-CTS
E . RTS/CTS

Answer: E