For an absolutely white or specular body-(where α = absorptivity, ρ = reflectivity, τ = transmissivity)

• A. α = 1, ρ = 0 and τ = 0
• B. ρ = 1 and α = τ = 0
• C. τ = 1 and α = ρ = 0
• D. α + τ = 1 and ρ = 0