Which one of the following relations is not correct?

• A. f(t) δ(t) = f(0) δ(t)
• B. \(\displaystyle\int_{-\infty}^\infty f(t) \ \delta(\tau) \ d\tau =1\)
• C. \(\displaystyle\int_{-\infty}^\infty \delta(\tau) \ d(\tau) =1\)
• D. f(t) δ(t - τ) = f(τ) δ(t - τ)