Which of the following function chooses a random index as pivot.

A.

void partition_random(int arr[], int low, int high) 
{     
    srand(time(NULL)); 
    int random = low + rand() % (high - low); 
    swap(arr[random], arr[high]); 
}

B.

void partition_random(int arr[], int low, int high) 
{    
    srand(time(NULL)); 
    int random = high + rand() % (high - low); 
    swap(arr[random], arr[high]); 
}

C.

void partition_random(int arr[], int low, int high) 
{     
    srand(1); 
    int random = low + rand() % (high - low); 
    swap(arr[random], arr[high]); 
}

D.

void partition_random(int arr[], int low, int high) 
{     
    srand(time(NULL)); 
    int random = low + rand() % (high - low-1); 
    swap(arr[low], arr[high]); 
}

Answer: Option A