Please answer in c, Im having a hard time trying to figure this out. Thank you! number 2 please!

C. (2pt) Write a function to check if all the numbers in a given integer array are unique numbers or not. If yes, it returns 1; otherwise it returns 0 int check_ if unique (int *arr, int n) d. (4pt) Suppose we want to compute the sum of the integer values in a given array using the following function prototype: int arr_sum( int arr, int n This function can simply be implemented as an iterative function. However, you are asked to think about a recursive strategy and implement arr_sum (. . .) as a recursive function. (No credit will be given for an iterative implementation!) int arr sum( int arr[], int n ) // must be recursive to get 4pt 2. (15pt) Suppose we store a 2D array of double values in a text file as follows: First two integers represent the numbers of rows and columns. File then contains that many rows and columns of double values. For example a 3x 10 matrix of double values can be stored as follows: 2.7 3.4 5.3 10 5.3 4.6 4.5 3.8 4.5 3.4 5.3 3.9 1.3 5.8 4.5 3.8 4.5 1.3 5.3 2.9 4.5 5.8 1.3 5.3 4.5 5.3 3.5 Write a program that takes the name of such a file from the command line and finds/prints the average of each column on the screen. For the above file your program should print out 4.5 3.8 4.8 3.9 3.0 3.5 4.7 3.7 4.4 3.4