Suppose variables a and b are of type int in a C++ program. What will be assigned to b in the following statements? a=20;b=a/8; 2.5 (B) 2 3 4 Which of the following C++ array declarations with initialization is valid? grades[ 4]{100,90,99,80} type int; (B) int grades [n];// where n is an int variable (C) int grades[3] ={100,90,99,80}; (D) int grades[4] ={100,90,99,80}; The definition of big-O is that given two functions f and g from set of integers or real numbers to the set of real numbers, then f is O(g) means. f(x)k. there exist constants C and k such that f(x)=Cg(x) for x>k. (D) f(x)>g(x) for all x The following code will output if it is part of a program that compiles correctly and the array has 2468 in first, second, third and fourth positions respectively?. for (int i=4;i>=1;i) \{ \} cout x[i1]; (A) 2468 (B) 8642 8264 2648 An algorithm that completes a task on n items using a count of iterations that is proportional to nb where b is a constant is said to have complexity. (A) constant (B) linear (C) polynomial (D) exponential