I am developing an internal support request form.
In order to capture useful information, I've divided the request types in four categories. (Say A, B, C and D)
On selecting an option a form opens which is different for all four request types.
My problem is about presenting request type selection right on the homepage.
A mockup below
Being an internal tool, homepage would not have anything more than a company banner and some background.
I've considered using buttons and drop down menu but can't figure what to use and why.