Is it must to use all three antenas in 1250 series for wireless n?

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Is it must to use all three antenas in 1250 series for wireless n?
I want to use Cisco 1250 series devices ( AIR-LAP1252G-E-K9  at 2.4 GHZ ) with wireless
controller of 4400 or 5500 series.
I want to use wall mount patch antenas (I will choose any one of the  following models)
AIR-ANT2460P-R   6 dBi Patch Antenna
or
AIR-ANT2465P-R   Diversity Patch 6.5 dBi
or
AIR-ANT2485P-R   Patch  8.5 dBi
Now my questions are :
01. The 1250 series has options for three antenas connectivity.is it must to use all the three antenas on each LAP ?
02.Suppose I want my Access point to support wireless G and Wireless N ,then can i get it done by using ONLY ONE ANTENA?
03.Suppose I want  my LAP to support only wireless n clients then can I use only one antena on each access point?
04.There are thick concrete walls comming on the way.Which of the above antenas you suggest best?
Thanx in advance.Please answer.
Regrds
Abdul

Hi Abdul,
Please avoid making multiple post of the same topic.  It really confuses everyone (including you).
Kindly refer to our response:  https://supportforums.cisco.com/message/3022312#3022312
Best Regards

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