That depends if you are:
Just preparing the query string to be sent, and are then relocating the user to CouncilB's website to see the results
Preparing the query, searching CouncilB's website but showing the results on your own site (after some scraping/re-formatting)
Simply copying the query parameters to be used on your own website and your own search in which case your form simply uses the GET method.
<form action="search.htm" method="GET">
The resulting URL is