IKMC 2018 - Grades 9-10 - Self-study Question 2

How many of these four numbers are multiples of 10: a) $2^{100}+2^{102}$; b) $3^{100}+3^{102}$; c) $5^{100}+5^{101}$; d) $9^{100}+9^{101}$?