Explanation
The syntax that would be best for detecting or preventing on all subdomains as well is
*.baddomain.xyz|baddomain. xyz. This syntax will match any domain that ends with .baddomain.xyz or is exactly baddomain.xyz. The * wildcard will match any characters before the dot, and the | operator will match either side of the expression. This syntax can be used in a Custom IOC or a Custom IOA rule to detect or prevent network connections to malicious domains1.
References: 1: Falcon Administrator Learning Path | Infographic | CrowdStrike

Explanation
The page of the Falcon console where one can locate the Customer ID (CID) is API Clients and Keys. The API Clients and Keys page allows you to create and manage API clients and keys for accessing the Falcon platform programmatically. The Customer ID (CID) is a unique identifier for your organization that is required for authenticating your API requests. You can find your CID at the top of the API Clients and Keys page2.
References: 2: Cybersecurity Resources | CrowdStrike

Explanation
The sensor uses TCP port 443 (HTTPS) to communicate with the CrowdStrike Cloud. This port and protocol are used to securely send and receive data between the sensor and the cloud, such as detections, policies, updates, commands, etc. The other options are either incorrect or not used by the sensor.
Reference: CrowdStrike Falcon User Guide, page 28.