(1) Please briefly describe the development stage of international settlement. (2) Please briefly describe the basic functions of the bill. (3) Please briefly describe the main role of basic commercial invoice. (4) Please compare and analyze the differences between the following headings. a. Pay to E Co. only b. Pay to E Co. or order c. Pay to bearer (5) Please compare and analyze the differences between the following payment order. a. Pay to ECo.ororderthesumofUSdollarsonethousandonly and debit the same to No. X account of DCo. with you. b. Pay to E Co. or order the sum of US dollars one thousand only provided that the goods they supply are up to the standard of the contract