For a sand with (d₆₀=0.70) mm, (d₃₀=0.45) mm, and (d₁₀=0.30) mm, what is the uniformity coefficient and coefficient of gradation? Is it a well-graded or a poorly graded soil?

a) Uniformity coefficient: 1.5, Coefficient of gradation: 1.5, Well-graded
b) Uniformity coefficient: 2.33, Coefficient of gradation: 1.5, Poorly graded
c) Uniformity coefficient: 2.33, Coefficient of gradation: 2.33, Well-graded
d) Uniformity coefficient: 1.5, Coefficient of gradation: 2.33, Poorly graded