Which NSDataReadingOptions should be used when reading a local file?
<p>When reading a local file with <code>NSData(contentsOfURL:options:)</code>, which one is the appropriate reading option?</p>

<p>Also there is a <code>NSData(contentsOfURL:)</code> without <code>NSDataReadingOptions</code>. Which reading option does it use by default?</p>

<p>For reference the Apple <a href="https://developer.apple.com/library/mac/documentation/Cocoa/Reference/Foundation/Classes/NSData_Class/#//apple_ref/c/tdef/NSDataReadingOptions" rel="noreferrer">docs</a>.</p>