It is possible to work around the third option failing - you can purchase:
Each of these alternatives will cover your domain with and without www. But it is arguably an unnecessary cost.
Based on empirical evidence, this is an issue that does not have to be addressed at all – we have never had a help desk enquiry from a user typing in https://www/...
Most of our clients who have bought their own SSL certificate only bought one single-domain certificate. Occasionally a client has purchased a certificate that allows Subject Alternative Names
When Lookatme buys certificates for clients we only buy one single-domain certificate.
The best way to promote your URL to your users is like this:
If you wish to make it a link, either add https:// at the front or right-click in Word and add as a hyperlink the full URL which is like this: https://yourdomain.com/.