Final answer:
To set up a custom tracking domain on SalesLoft, you would use a DNS record, specifically a CNAME record, and not an API, SMTP server, or SSL certificate.
Step-by-step explanation:
To set up a custom tracking domain on SalesLoft, you would use a DNS record. When companies want to ensure that the tracking domain matches their company's domain, they can set up a CNAME record, which is a type of DNS record, to point to SalesLoft's tracking infrastructure. This establishes trust and maintains brand consistency in email communications. Setting up a custom tracking domain does not involve an API, SMTP server, nor an SSL certificate directly, though an SSL certificate might be used to secure the custom domain.