Which statement correctly describes a difference between the form helper methods form_tag and form_for?
a. The form_tag method is for basic forms, while the form_for method is for multipart forms that include file uploads.
b. The form_tag method is for HTTP requests, while the form_for method is for AJAX requests.
c. The form_tag method typically expects a URL as its first argument, while the form_for method typically expects a model object.
d. The form_tag method is evaluated at runtime, while the form_for method is precompiled and cached.