Which two statements about PDU encapsulation are true? (Choose two.)

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Which two statements about PDU encapsulation are true? (Choose two.)

During encapsulation, each layer adds a header and trailer to the PDU from the layer below
During encapsulation, each layer adds a header and sometimes adds a trailer to the PDU from the layer above
In the TCP/IP reference model, PDU encapsulation occurs on the network layer
PDU encapsulation takes place only at the transport layer
In the TCP/IP reference model, PDU encapsulation starts on the Internet layer with the data from the application layer

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