Which one is correct to declare & initialize an array in C?

Which one is correct to declare & initialize an array in C?

1. a) int arr(5) = (1,2,3,4,5);
2. b) int arr[5] = {1,2,3,4,5};
3. c) int arr() = 1,2,3,4,5;
4. d) Array arr(5) = {1,2,3,4,5};