The instantaneous rate of change of the vector-valued function g(t) is given by r(t) = ⟨t², √(1-t²)⟩. If g(7) = ⟨2, π⟩, which of the following is g(0)?
a) ⟨0, 1⟩
b) ⟨0, 0⟩
c) ⟨2, 0⟩
d) ⟨1, 0⟩