newbie question: how to confirm bluetooth version a system support

1.  bluetooth 4.0  ?=  bluetooth 4.0 LE , i.e. iPhone4s supports
bluetooth 4.0, does that mean it support bluetooth 4.0 LE ?
     I know that bluetooth 3.0 != bluetooth 3.0 HS

2.  my android phone project, msm7225A platform , bluetooth chip is
WCN2243 .  which version can be defined?

3.  in short ,  from hardware and software aspects, how to confirm
bluetooth version (when using bluez stack)

it is really a problem that confusing me for a long time.
appreciate anyone give some help.