Write a C++ program as described below:

- char** f(int n). It creates a triangular two-dimensional array such that row 1 has 1 element, row 2 has two elements and so on.

- int main() calls the function f(5) and initializes the array to appear as

A

B C

D E F

G H I J

K L M N O

- Print the array as formatted above.