(A) The number of outbound links from your website to other sites.
(B) The number of inbound links to your website.
(C) The number of unique domains that link to your website.
(D) The quality of inbound links to your website.
This question is from the HubSpot SEO Certification Exam. You can get all the answers to the questions asked in this exam on our HubSpot SEO Certification Exam Answers page.