What Is the Mechanism Behind Threat Extraction

What is the mechanism behind Threat Extraction?

A) This is a new mechanism which extracts malicious files from a document to use it as a counter-attack against its sender
B) This is a new mechanism which is able to collect malicious files out of any kind of file types to destroy it prior to sending it to the intended recipient
C) This is a new mechanism to identify the IP address of the sender of malicious codes and to put it into the SAM database (Suspicious Activity Monitoring) .
D) Any active contents of a document, such as JavaScripts, macros and links will be removed from the document and forwarded to the intended recipient, which makes this solution very fast