Applying the provisions of Contract Act 1872 and general commercial law norms and principles how you think on the ground of ongoing Covid-19 pandemic (a) a buyer in the RMG sector not wanting to pay ; (b) a seller in the RMG sector failing to procure and supply or finds it difficult to do so ; (c) A bank facing a legal challenge from the buyer asking the bank not to pay under an irrevocable and confirmedletter of credit in favor of the seller, may deal with the respectivesituations ?