4) After the government of the country decided to build the monorail, it invites construction companies to bid for the building of the railway. a) After XYZ construction company Egypt is awarded the contract of building the railway, it receives the advance payment from the government. What is the bank instrument that would best secure that the government would get back its advance payment if XYZ company did not abide by the contract. c) After XYZ company Egypt is awarded the contract, it decides to buy the building materials needed from ABC company in China. Knowing that XYZ and ABC company have no previous relations, what is the bank instrument that would best secure this trade transaction. What are the risks that each bank (the bank of XYZ company and the bank of ABC company) are carrying