Explanation: Explanation
Site-to-Site VPN Components:
CPE OBJECT: At your end of Site-to-Site VPN is the actual device in your on-premises network (whether hardware or software). The term customer-premises equipment (CPE) is commonly used in some industries to refer to this type of on-premises equipment.
DYNAMIC ROUTING GATEWAY (DRG): At Oracle's end of Site-to-Site VPN is a virtual router called a dynamic routing gateway, which is the gateway into your VCN from your on-premises network.
IPSEC CONNECTION: After creating the CPE object and DRG, you connect them by creating an IPSec connection, which you can think of as a parent object that represents the Site-to-Site VPN.
TUNNEL: An IPSec tunnel is used to encrypt traffic between secure IPSec endpoints. Oracle cre-ates two tunnels in each IPSec connection for redundancy.
So, Internet Gateway, NAT Gateway are NOT valid Site-to-Site VPN Components.
Hence, Dynamic Routing Gateway (DRG), Customer Premises Equipment (CPE), and IPsec tunnel is the CORRECT answer.