What does the X-Header Insertion feature on the Cisco ASR 5000 enable the operator to do?

What does the X-Header Insertion feature on the Cisco ASR 5000 enable the operator to
do?

A.
Insert entity-header fields into HTTP/WSP GET and POST request packets

B.
Insert RFC based header fields into HTTP GET request packets

C.
Insert additional GET and POST headers into HTTP packets

D.
Insert content-type headers into HTTP/WSP GET and POST request packets