16 Anna obtains an invention patent but fails to mark the certificate number on the patented article under Article 98of the Patent Act in Taiwan. Later, Anna discovers that Elsa infringes her patent, Anna
(A)is prohibited to sue Elsa because there is no certificate number marked on the patent article.
(B)is prohibited to sue Elsa because Anna violates the law.
(C)still can sue Elsa but Anna has to prove that Elsa knows or has a reason to know that the said article is under patent protection.
(D)still can sue Elsa and Elsa has to prove that she does not know nor has a reason to know that the said article is under patent protection.