"The council believes that the DOL should clarify the legal standards applicable to plan fiduciaries in the following areas: [1] The plan sponsor's fiduciary duties when the plan document designates a named fiduciary other than the plan sponsor. [2] A plan fiduciary's scope of liability when the fiduciary hires a service provider who is not a fiduciary. [3] Whether a plan fiduciary who hires another fiduciary has obligations beyond the duty to select and monitor the hired fiduciary. [4] More guidance on the standard of knowledge required to hold a co-fiduciary liable for the actions of another fiduciary."