The fifth option is a link to the tool we wrote that allows users to look more in depth at mortgages rates. We designed the mortgage rates tool to look generic so it would fit in with most websites.
The user can set a time period and pick which mortgage products to look at. A user can graph the mortgage rates over a time period or create a graph of what the mortgage would be on a 200k house based on mortgage rate. Below is the code for the second option that you can copy and paste into your HTML.