How does the 802.11 MAC four frame exchange protocol improve reliable data delivery between source and destination devices?       a.  the source sends an RTS, while the destination sends a CTS, both of which are heard by all devices on the WLAN       b.  RTS and CTS establishes a virtual connection that is independent of any devices within the WLAN       c.  the RTS is heard by all devices within range of the source, while the CTS is heard by all devices within the range of the destination.  In this way, all devices within range of source, destination, or both, are notified of the transmission.       d.  RTS and CTS are only used for connection-oriented, centralized data exchanges

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