1)unsigned int SumOfDigits(unsigned int n) Description: Develop a function that takes a non-negative integer n as a parameter and returns a non-negative integer containing the sum of ns digits. For example, if the input parameter n was 17239 then the output of this function should be 1 + 7 + 2 + 3 + 9 = 22

2) void AdjustArray(int arr[], unsigned int size) Description: Develop a function that takes an array of integers and its size as two parameters and does the following: For elements of the array with odd indices, the function should reverse their sign (e.g., if the element was 37, it becomes -37; if the element of the array was -5, it becomes 5). For elements with even indices, the function sets them to zero.

3)unsigned long GetBinomialCoefficient(unsigned int n, unsigned int m) Description: Develop a function that takes two positive integers n and m (n m) as parameters and returns their binomial coefficient

Also please explain what each function is doing, thank you!