Question:
You need to create a servlet filter that stores all request headers to a
database for all requests to the web application's home page "/index.jsp". Which HttpServletRequest  method allows you to retrieve all of the request headers?

Option A):
java.util.Iterator getHeaderNames()
Option B):
String[] getRequestHeaders()
Option C):
java.util.Iterator getRequestHeaders()
Option D):
java.util.Enumeration getHeaderNames()

Correct Answer is Option D):
java.util.Enumeration getHeaderNames()