a.Remove the cookie from the System.Web.UI.Page.Request.Cookies
collection.
b.Remove the cookie from the System.Web.UI.Page.Request.Browser.Cookies
collection.
c.Set the Expires property to DataTime.Now for a cookie in the
Web.UI.Page.Response.Cookies.
d.Remove the cookies from the System.Web.UI.Page.Response.Cookies
collection.