21 In accordance with the Patent Act, the patent approval decision was made on Dec. 2, 2015 and served on applicant on Dec. 20, 2015. What is the deadline for the payment of patent certificate fee and the first-year patent annuity?
(A) Mar. 2, 2016
(B) Mar. 20, 2016
(C) Sep. 2, 2016
(D) Sep. 20, 2016

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統計: A(0), B(4), C(0), D(0), E(0) #2439107