What is a valid reason to choose an 802.11a wireless implementation?

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What is a valid reason to choose an 802.11a wireless implementation?
A . It supports a large range (distance) from the AP at a given data speed
B . It has fewer available channels than 802.11b/g, enabling easier deployment
C . It has transmission speed higher than 802.11n
D . It will not interface with an 802.11b/g installation.

Answer: D