Which is true about the web container request processing model?

Which is true about the web container request processing model?

A.
The init method on a filter is called the first time a servlet mapped to that filter is invoked.

B.
A filter defined for a servlet must always forward control to the next resource in the filter chain.

C.
Filters associated with a named servlet are applied in the order they appear in the web
application deployment descriptor file.

D.
If the init method on a filter throws an UnavailableException, then the container will make no
further attempt to execute it.

Explanation: