(a) In the event of the PSOB Office's denying a claim, the notice it serves upon the claimant shall -

(b) No financial claim shall be approved, unless the claimant's threshold claim has been approved.

(c) Upon a claimant's failure (without reasonable justification or excuse) to pursue in timely fashion the determination of his filed claim, the Director may, at his discretion, deem the same to be abandoned, as though never filed. Not less than thirty-three days prior thereto, the PSOB Office shall serve the claimant with notice of the Director's intention to exercise such discretion.