Give an example of the following or explain why no such example exists. a. a graph with no vertices of odd degree. b. a graph with no vertices of even degree. c. a graph with live or more vertices such that no two adjacent vertices have the same degree. d. a graph with exactly five vertices that is isomorphic to its complement.

Consider the following code snippet: #ifndef cashregister_h#define cashregister_hconst double max_balance = 6000000.0; class cashregister{public: cashregister(); cashregister(double new_balance); void set_balance(double new_balance); double get_balance() const; private: double balance[12]; }; double get_monthly_balance(cashregister bk, int month); #endifwhich of the following is correct? a)the header file is correct as given.b)the definition of max_balance should be removed since header files should not contain constants.c)the definition of cashregister should be removed since header files should not contain class definitions.d)the body of the get_monthly_balance function should be added to the header file.

List a few alternative options and input and output over the standerd keyboard and monitor. explain their functioning in details.

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