Which of the following can be used to replace /* missing loop header */ so that the method will work as intended?

a) for(int i = 0; i < array.length; i++)
b) for(int i = 0; i <= array.length - 1; i++)
c) for(int i = 1; i <= array.length; i++)
d) for(int i = 1; i < array.length + 1; i++)