Determine which of these sets are subsets of which other of these sets. Sets are: a = {2,4,5}, b = {4,2}, c = {{2},{4}}, d = {1,2,4,5,{6}}
a) a ⊆ b, c ⊆ b, a ⊆ d, c ⊆ d
b) a ⊆ d, b ⊆ d, c ⊆ d
c) b ⊆ a, b ⊆ d, c ⊆ d
d) a ⊆ b, b ⊆ d, c ⊆ d