shall automatically be deemed (unless it is expressly provided therein that any such provision is excluded) to contain provisions authorizing the holders of not less than a majority in principal amount of the indenture securities or if expressly specified in such indenture, of any series of securities at the time outstanding (A) to direct the time, method, and place of conducting any proceeding for any remedy available to such trustee, or exercising any trust or power conferred upon such trustee, under such indenture, or (B) on behalf of the holders of all such indenture securities, to consent to the waiver of any past default and its consequences; or

may contain provisions authorizing the holders of not less than 75 per centum in principal amount of the indenture securities or if expressly specified in such indenture, of any series of securities at the time outstanding to consent on behalf of the holders of all such indenture securities to the postponement of any interest payment for a period not exceeding three years from its due date.