Code Example $2-1$

public class HomeController : Controller

$\{$

public IActionResult Index$()$

$\{$

ViewBag.Description $=$ "Gibson Les Paul";

ViewBag.Price $=699\mathrm{.}99$;

return View$()$;

$\}$

$\}$

Refer to Code Example $2-1.$ Which one of the following is an action of the HomeController class?

a$.$ ViewBag

b$.$ IActionResult

c$.$ View$()$

d$.$ Index$()$