How many line(s) should be changed/added to make class Res-Visitors a emplate class? nswer: class Res_Visitors public: int vis[100]; int count;01010101111110 }; iTc 111101101 001010 1010101010101 Res Visitors(); int getCount(); void addVisitor(int v); void print(); Which of the following is correct about pairs? (Select all that apply) a. Pair can be assigned, copied and compared. The array of objects allocated in a map or hash_map are of type 'pair' by default in which all the 'second' elements are unique keys associated with their 'first' value objects. b. The pair container is a simple container consisting of two data elements or objects. c. The first element is referenced as 'first' and the second element as 'second' and the order is fixed (first, second). d. Pair is used to combine together two values which should be different in type. e. Pairs provide a way to store objects that must be heterogeneous as a single unit. f. We use the same member access operator that is used in classes to access elements in pairs. g. They are hard to sort comparing to structures. What is the purpose of prototypes in classes? (Select all that apply) a. Improve memory optimization. b. Assist in the building process. c. Hide the detailed implementation. d. Prototypes are useless. e. Assist in linker process. f. To reduce class size. 101 010101111110 010101010101 11010101010 01011001

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