Explanation:
URL line: organizations/{Org_ID}/networks
First body field (key): "type"
First body field (value): "combined"
Request method: "POST"
organizations/{Org_ID}/networks is the correct endpoint to create a new network under a given organization.
The "type": "combined" field specifies the network type that supports multiple product types (like wireless and camera).
The HTTP method POST is used to create new resources in REST APIs.