Computation of probability from discrete distribution

An electronics marketer has industrialised the following probability distribution of the number of television sets owned by a household.
Number of Television Sets Owned by Household Probability

0 0.04

1 0.24

2 0.33

3 0.21

4 0.13

5 0.05

Regulate the probability that a household owns at least three television sets.

a) 0.18

b) 0.21

c) 0.39

d) 0.61