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A 2.6-hectare coastal agricultural lot was registered under Presidential Decree No. 1529 after due notice and a public hearing, resulting in a decree of registration in the applicant’s favor. A neighboring coastal fisherfolk association, the Isla Verde Fisherfolk Federation, claims it has tilled a portion of the land for over ten years and asserts it was not properly served with notice, contending that due process was violated. It files a petition for certiorari and prohibition under Rule 65 challenging the decree on grounds of grave abuse of discretion and lack of due process. (a) Identify the controlling doctrine governing the proper remedy to challenge a decree of registration. (b) Distinguish this remedy from ordinary appeals or other post-decree remedies in land registration. (c) Apply to the facts: Is the Isla Verde Fisherfolk Federation’s petition proper? What is the likely outcome and why?