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Give an E-R diagram and the simplest possible representative occurrence diagram for each of the following situations; State any assumptions you made:

(a) The borrowing relationship between students and books in a library at the current time (i.e. no historical information is kept). Assume that the library only has one copy of each book.

b)The "Director_of" relationship between AOU faculty members and AOU branches, given that all AOU branch directors are also faculty members.

(c) The relationship between Countries and their current ruler (President, King, Emir, etc.).

(d) The manufacturing relationship between all companies and car models (for example Coca-Cola and Toyota Corolla). Assume that there are no jointly manufactured cars.

(e) The manufacturing relationship between car companies and car models (for example General Motors and Taurus).

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