; (2) by redesignating subsection (b) as subsection (d); and (3) by inserting after subsection (a) the following new subsections: (b) Responsibilities In addition to performing the functions under section 3506 of title 44, United States Code, the Chief Information Officer shall serve as the lead technical authority for information technology programs of the Department and Department components and, in consultation with the Under Secretary for Management, shall— (1) advise and assist the Secretary, heads of the components of the Department, and other senior officers in carrying out the responsibilities of the Department for all activities relating to the budgets, programs, security, and operations of the information technology functions of the Department; (2) to the extent delegated by the Secretary, exercise leadership and authority over Department information technology management and establish the information technology priorities, policies, processes, standards, guidelines, and procedures of the Department to ensure interoperability and standardization of information technology; (3) maintain a consolidated inventory of the mission critical and mission essential information systems of the Department, and develop and maintain contingency plans for responding to a disruption in the operation of any of those information systems; (4) maintain the security, visibility, reliability, integrity, and availability of data and information technology of the Department; (5) establish and implement policies and procedures to effectively monitor and manage vulnerabilities in the supply chain for purchases of information technology, in consultation with the Chief Procurement Officer of the Department; (6) review contracts and interagency agreements associated with major information technology investments and information technology investments that have had cost, schedule, or performance challenges in the past