Refer to the exhibit. A network administrator is configuring a VPN between routers R1 and R2. Which commands would correctly configure a pre-shared key for the two routers?

Refer to the exhibit. A network administrator is configuring a VPN between routers R1 and R2. Which commands would correctly configure a pre-shared key for the two routers?

• R1(config)# username R2 password 5tayout!
  R2(config)# username R1 password 5tayout!
• R1(config)# crypto isakmp key 5tayout! address 64.100.0.2
  R2(config)# crypto isakmp key 5tayout! address 64.100.0.1
• R1(config)# crypto isakmp key 5tayout! hostname R1
  R2(config)# crypto isakmp key 5tayout! hostname R2
• R1(config-if)# ppp pap sent-username R1 password 5tayout!
  R2(config-if)# ppp pap sent-username R2 password 5tayout!