The number 'a' is randomly selected from the set {0,1,2,3,…….98, 99). The number ' b ' is selected from the same set.
Probability that the number 3ᵃ+7ᵇ has a digit equal to 8 at the units place, is...
a. 1/16
b. 2/16
c. 4/16
d. 3/16