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The reservations which each of the Applicants formulated upon accepting the lump sum are not binding on the Administration since, at the time the agreement was signed, the Administration and the staff member were not in a contractual situation in which each could negotiate rights. Instead, they were in a situation governed by rules in which the Administration could only apply the rules and the staff member could only accept or reject the lump-sum payment proposed. The applicants contend that only by accepting the lump-sum payment with reservations could they challenge the basis on which the Administration calculated that payment. This contention is ill-founded. The standard memorandum by which the Administration notified each applicant of the lump-sum payment he or she would receive upon exercise of that option constituted an administrative decision; in other words, it was a unilateral act by the Administration of a conclusive and individual nature. As such, it was appealable as soon as its adverse effect was felt if the lump-sum payment was rejected because of the incorrect basis of calculation. Contrary to what the Applicants contend therefore, only a refusal to accept the lump-sum payment entitled them to contest the amount.