Which of the following are the features of Zend_Controller_Front?
Each correct answer represents a complete solution. Choose all that apply.

A.
By default, the ErrorHandler plugin and ViewRenderer action helper plugin are loaded in
Zend_Controller_Front.

B.
It is used to register a plugin broker, which allows calling a user code when certain events occur
in controller process.

C.
It is used to implement the Singleton pattern.

D.
It is used to handle the request and output.

Explanation: