Suppose that the diameters of different types of hairs are 1.7 × 10^–4 cm, 1.4 × 10^–3 cm, 1.2 × 10^–5 cm, and 1.9 × 10^–4 cm. What is the order of the hairs from least to greatest diameter?

1.2 × 10^–5 cm, 1.7 × 10^–4 cm, 1.9 × 10^–4 cm, 1.4 × 10^–3 cm