Which of the following descriptions about GRE are correct ? ( Choose one or more )

On a router perform row displa'interface tunnel explicit shown GRE tunnel interface as follows :
<Router>displa interface Tunnel 0
Tunnelo current statle: UP
Line protocol current state: UP
Description: Tunnel 0 Interface
T he Maximum transmit Unit is 1476
Internet Addess is 192.1.1.1/24 Primar.
Encapsulation isTUNNELT aggregation ID not- et
Tunnel source l0.1.11.1 destination 10.1.13.1
Tunnel keeepalive enable Period ( 10 s ) , Retries ( 3 )
Tunnel protocol/transport GRE/IP.
GRE key disable
Checksumming of GRE packets disabled
Last 300 seconds input:.0 btes/secl 0 packet/sec.
Last 300 seconds output:..0 bytes/sec , 0 packets/sec.
4 packets input 72bytes.
0 input error
1 packets output , 24 btes
0 0utput error
From the above information, we can know ____ .( Choose one or more )

The factors that affect VoIP voice quality include ____ .

How do you view PE device learns to BGP private network routes _______ .

Please add the correct parameters in the following PPPoE Cllent configuration: