The big-O notation for f(n) = (nlogn + n^2)(n^3+2) is ? Select one: O a. O(3n) O b. O(n^5) O c. On^4) O d. O(n^2) What data structure can be used to check if a syntax has balanced parenthesis? Select one: O A. Stack B. Array O C. Vector O D. List O &