Question #13What is the time complexity of inserting at index n on an unsorted array?O(n!)O(2^n)O(1)O(n)O(nlog(n))O(n^2)O(log(n))Question #14What is the time complexity of searching for an element in a stack of size n?O(n!)O(2^n)O(1)O(n)O(nlog(n))O(n^2)O(log(n))Question #15What is the time complexity of best case deletion from a hash table with the implementation you used during the previous Hash Table C project (chaining)?O(n!)O(2^n)O(1)O(n)O(nlog(n))O(n^2)O(log(n))Question #16What is the time complexity of accessing the nth element of a doubly linked list?O(n!)O(2^n)O(1)O(n)O(nlog(n))O(n^2)O(log(n))Question #17What is the time complexity of setting a value at index n in an unsorted array?O(n!)O(2^n)O(1)O(n)O(nlog(n))O(n^2)O(log(n))Question #18What is the time complexity accessing the nth element in an unsorted Python 3 list?O(n!)O(2^n)O(1)O(n)O(nlog(n))O(n^2)O(log(n))Question #19What is the time complexity of this function / algorithm?var factorial = function(n) { if(n == 0) { return 1 } else { return n * factorial(n - 1); }}O(n!)O(2^n)O(1)O(n)O(nlog(n))O(n^2)O(log(n))Question #20What is the time complexity of this function / algorithm?void f(int n){ int i; int j; for (i = 0; i < n; i++) { for (j = i + 1; j < n; j++) { printf("[%d] [%d]\n", i, j); } }}O(n!)O(2^n)O(1)O(n)O(nlog(n))O(n^2)O(log(n))Question #21What is the time complexity of removing at index n from an unsorted Python 3 list?O(n!)O(2^n)O(1)O(n)O(nlog(n))O(n^2)O(log(n))Question #22What is the time complexity of accessing the nth element on an unsorted array?O(n!)O(2^n)O(1)O(n)O(nlog(n))O(n^2)O(log(n))Question #23What is the time complexity of this function / algorithm?void f(unsigned int n){ int i; for (i = 1; i < n; i = i * 2) { printf("[%d]\n", i); }}O(n!)O(2^n)O(1)O(n)O(nlog(n))O(n^2)O(log(n))