(1) With respect to a grievance based on an alleged violation of a law, rule, regulation, or policy directive referred to in section
4131 (a)(1)(H) of this title, a grievant may either
(A) file a grievance under this subchapter, or
(B) initiate in writing a proceeding under another provision of law, regulation, or Executive order that authorizes relief,
but not both.
(2) A grievant shall be considered to have exercised the option under paragraph (1) as soon as the grievant timely either
(A) files a grievance under this subchapter, or
(B) initiates in writing a proceeding under such other provision of law, regulation, or Executive order.