Given a = [-1 74; -1 -2] ~ [10 0; 0 10], let a₁⃗ and a₂⃗ be the columns of a, let b = {a₁⃗,a₂⃗}, and let h = span(b). What is h?
a) h = span(a₁⃗,a₂⃗)
b) h = span(a)
c) h = span([10; 0], [0; 10])
d) h = span(0)