please help me to figure question a and b, thank you

(a) Examine the following incidents and identify whether the salvage effort is legally recognised. Your answer should start with either 'Saivage' or 'Non salvage' followed by the reasons. Justify your answer by using suitable elements of salvage. (1) A salvage boat belonging to a salvage company is rescuing a beacon from sinking. (2) A navy vessel assisting a container vessel from sinking. (3) Two tug boats from a salvage company unable to save a super tanker from sinking but managed to lay booms around the oil spills and prevent them from spreading closer to the coast. (4) A super tanker wanting to discharge her cargo in Port Dickson requested a harbour tug to tow her into port to ensure save navigation. (12 marks) (b) Refer to this High Court case: Choy Shipping Sdn Bhd vs. Abang Marine Insurances (M) Berhad. In the case dispute, the plaintiff was the owner of a ship known as the Bittersweet. The defendant is the insurer. The ship was insured under H 8. M policy for an agreed value of RMS million. Part of the policy that states 'Warranted vessel be properly and reasonably maintained. equipped. kept- up, officered and manned during the currency of this policy\". The vessel sank when it hit some hard object in high sea. The defendant denied liability on the ground that plaintiff breached expressed warranty in the policy. The defendant's case is that the \"certificate of competency\" of the Master had expired and therefore the ship was not properly "officered'. Use the principle of marine insurance for your argument on this case