In which of the following arrangements is the order correct according to the property indicated against it?
a. Ascending order of values: [1, 2, 3, 4]
b. Descending order of values: [9, 7, 4, 2]
c. Ascending order of index: [0, 1, 2, 3]
d. Descending order of index: [3, 2, 1, 0]