Option D is correct.
Explanation :
- In option A, it is not mandatory that a function will have arguments and it will return a value.
- In option B, no formula begins with =.
- In option C, it is not necessary to begin with /.
- In option D, MAX function should return maximum value in the set given.
Thus, option D is correct because arguments of a function are always enclosed within parentheses
Example:
SUM (30,70)