A User Has Configured an SSL Listener at ELB as Well

A user has configured an SSL listener at ELB as well as on the back-end instances. Which of the below mentioned statements helps the user understand ELB traffic handling with respect to the SSL listener?

A) It is not possible to have the SSL listener both at ELB and back-end instances
B) ELB will modify headers to add requestor details
C) ELB will intercept the request to add the cookie details if sticky session is enabled
D) ELB will not modify the headers