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  )

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Answer:   DE