title: ARC enabled App will run in lower version of ios
body: <p>I have developed an application using xcode 4.3.2 with ARC enabled ,my app users having  ios3.2, ios4.0,ios5.0 devices how can I give support to lower version ios device uses .Should I need to do anything in code side . or Is there any way set ARC dynamically like.</p>
  
  <p>Any have any idea regarding this plz share with me.
          Thanks  </p>