Given a fair 6-sided die (equal probability of landing 1, 2, 3, 4, 5, or 6), if you roll it 5 times and add up the results, what is the probability that the sum is divsible by 6?
a. 1/12
b. 5/36
c. 1/6
d. 5!/(6^5)
e. 6!/(6^5)
f. None of the above