; and (B) providing the Director with information requested and required to fulfill the responsibilities of the Director under paragraph (1). (3) Use of core services (A) In general Except as provided in subparagraph (B), each element of the intelligence community shall use core services when such services are available. (B) Exception The Director of National Intelligence may provide for a written exception to the requirement under subparagraph (A) if the Director determines there is a compelling financial or mission need for such exception. (c) Management accountability Not later than 90 days after the date of the enactment of this Act, the Director of National Intelligence shall designate and maintain one or more accountable executives of the intelligence community information technology environment to be responsible for— (1) management, financial control, and integration of such environment; (2) overseeing the performance of each core service, including establishing measurable service requirements and schedules; (3) to the degree feasible, ensuring testing of each core service of such environment, including testing by the intended users, to evaluate performance against measurable service requirements and to ensure the capability meets user requirements