Which of the following is correct to initialize arrays in C?

Which of the following is correct to initialize arrays in C?

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