Which of the following PPPoE packets may contain valid PPP Session-ID information ?

Which of the following PPPoE packets may contain valid PPP Session-ID information ?
A . PADI ( PPPoE Active Discover Initiation )
B . PADO ( PPPoE Active Discover Offer )
C . PADR ( PPPoE-Active Discover Request )
D . PADS ( PFoPoE Active Discover Session-Confirmation )
E . PADT ( PPPoE Active Discover Ter minate )

Answer: DE