Part $0.$ Create a C$++$ class $3$DArray to store a multidimensional array of size n x m x l $,$ implement the corresponding constructor $3$DArray$($int n$,$int m$,$int l$)$ for the memory allocation, with the destructor.

Part $1.$ Write an iterative function and a recursive function to compute:

Part $2.$ Determine the asymptotic notation using the big O and big Omega of the following expressions

The most important part is not the answer but the justification of the answer based on the definition. Reuse the definition to justify your answer.

Part $3.$ Implement the iterative version of the Fibonacci function:

void Fib$($int x$,$int$*$ result$)$