How to add class to this form_tag in Rails

Question

I have this form_tag and I need to add a class to it. Not sure how to do it without breaking it:

<%= form_tag sessions_path do %>

Answer 1

<%= form_tag session_path, :class => 'class_name' do %>

Answer 2

<%= form_tag sessions_path, html: { class: 'something' } do %>