help my exam is timed!

which of the terms is invalid as it pertains to an array

int arr + {5,10,15,20,25};

int arr[] = 5,10,15,20,25;

int []arr = { 5,10,15,20,25};

int arr [] = {5,10,15,20,25};

int [5] arr ={5,10,15,20,25};

int [] arr = new int {5,10,15,20,25};