Refer to the exhibit.

An engineer must establish multipoint GRE tunnels between hub router R6 and branch routers R1, R2, and R3.
Which configuration accomplishes this task on R1?
interface Tunnel 1
ip address 192.168.1.1 255.255.255.0
tunnel source e0/0
tunnel mode gre multipoint
ipnhrpnhs 192.168.1.6
ipnhrp map 192.168.1.6 192.1.10.1
ipnhrp map 192.168.1.2 192.1.20.2
ipnhrp map 192.168.1.3 192.1.30.3
interface Tunnel 1
ip address 192.168.1.1 255.255.255.0
tunnel source e0/1
tunnel mode gre multipoint
ipnhrpnhs 192.168.1.6
ipnhrp map 192. 168.1.6 192.1.10.6
interface Tunnel 1
ip address 192. 168.1.1 255.255.255.0
tunnel source e0/0
tunnel mode gre multipoint
ipnhrp network-id 1
ipnhrpnhs 192.168.1.6
ipnhrp map 192.168.1.6 192.1.10.6
interface Tunnel 1
ip address 192.168.1.1 255. 255.255.0
tunnel source e0/1
tunnel mode gre multipoint
ipnhrp network-id 1
ipnhrpnhs 192.168.1.6
ipnhrp map 192.168.1.6 192.1.10.1
ipnhrp map 192.168.1.2 192.1.20.2
ipnhrp map 192.168.1.3 192.1.30.3
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