How many channels of communication are open to each country in Example 4 if the countries are willing to speak to each other through two intermediaries?

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United States has diplomatic relations with Russia and with Mexico, but not with Cuba. Mexico has diplomatic relations with the United States and Russia, but not with Cuba. Russia has diplomatic relations with the United States, Mexico, and Cuba. Finally, Cuba has diplomatic relations with Russia, but not with the United States and not with Mexico. Note that a country is not considered to have diplomatic relations with itself. a. Write a matrix showing direct communication possibilities. b. Write a matrix showing the channels of communication that are open to the various countries if they are willing to speak through an intermediary. [A] = U.S. Russia Cuba Mexico U.S. Russia Cuba Mexico 1 0 1 0 1 0 0 0 1 1 0