The given bar graph shows the total number of air conditioners (ACs) of different brands, P, L, S, E and H (in thousand numbers) sold by a supplier in 2018 and 2019. Study the graph carefully and answer the following question.
For which of the following pairs of brands was the total number of ACs sold in 2018 and 2019 together equal?
1
H and L
2
E and H
3
S and H
4
P and S