Correct option is (a) .form-control-static
Easiest explanation: If we need to insert plain text next to a form label within horizontal form we can use .form-control-static class on <p> element. The .input-group class is a container to enhance input by adding an icon, text or button in front or behind it. An icon or help text next to the input field and button next to input is attached by .input-group-addon and .input-group-btn respectively.