1.Which of the following rods, (given radius rrr and length ℓ\ellℓ) each made of the same material and whose ends are maintained at the same temperature will conduct most heat?a.r=r0r = r_0r=r0, ℓ=ℓ0\ell = \ell_0ℓ=ℓ0b.r=2r0r = 2r_0r=2r0, ℓ=ℓ0\ell = \ell_0ℓ=ℓ0c.r=r0r = r_0r=r0, ℓ=2ℓ0\ell = 2\ell_0ℓ=2ℓ0d.r=2r0r = 2r_0r=2r0, ℓ=2ℓ0\ell = 2\ell_0ℓ=2ℓ0Login to continueOnly logged in users canattempt or see the solution.