; (B) an explanation why the notification required by paragraph (1) was not submitted in accordance with the requirements of such paragraph; (C) the dates of such head’s medical incapacitation, and if such head has resumed performing the functions and duties of the office, the date such head so resumed performing such functions and duties; and (D) an explanation why such head was medically incapacitated. (3) In the event the head of an Executive agency remains medically incapacitated on the date the report is submitted under paragraph (2), the person serving in an acting capacity as such head or, if no person is so acting, the first assistant to the office of such head, shall submit periodic updates, as such person or first assistant considers appropriate, to such report to the appropriate Federal officials. (4) In this subsection— (A) the term appropriate Federal officials means the Executive Office of the President, the Comptroller General of the United States, the Majority Leader of the Senate, the Minority Leader of the Senate, the Speaker of the House of Representatives, and the Minority Leader of the House of Representatives; (B) the terms medical incapacity and medically incapacitated mean, with respect to the head of an Executive agency, that such head is unable to perform the functions and duties of the office of such head due to sickness, injury, or other medical condition and such inability to perform the functions and duties of the office of such head constitutes a vacancy of the office of such head to which this section and sections 3345, 3346, 3347, 3348, 3349a, 3349b, 3349c, and 3349d apply; and (C) the term National Security Council means the council established under section 101 of the National Security Act of 1947 ( 50 U.S.C. 3021 ). .