What are the purposes of the AccessController class?
What will be an ideal response?
The AccessController class is used for three purposes:
* To decide whether access to a critical system resource is allowed or denied based on the current effective security policy
* To mark code as being "privileged," thus affecting subsequent access determinations
* To obtain a "snapshot" of the current calling context and enable access-control decisions from a different context can be made with respect to the saved context
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