What is the next step in the establishment of an IPsec VPN after IKE Phase 1 is complete?

What is the next step in the establishment of an IPsec VPN after IKE Phase 1 is complete?

• authentication of peers
• negotiation of the ISAKMP policy
• detection of interesting traffic
• negotiation of the IPsec SA policy
  

  Answers Explanation & Hints: Establishing an IPsec tunnel involves five steps: detection of interesting traffic defined by an ACL IKE Phase 1 in which peers negotiate ISAKMP SA policy IKE Phase 2 in which peers negotiate IPsec SA policy Creation of the IPsec tunnel Termination of the IPsec tunnel