What is the absolute value of the difference between the dollar convexity measures of the following two bonds that each have a par value of $$100?$ Bond X: $2-$year $8\%$ coupon bond with $8\%$ yield; Bond Z: $5-$year $9\%$ coupon bond with $8\%$ yield.

$$1,628\mathrm{.}78$

$$1,769\mathrm{.}71$

$$1,721\mathrm{.}74$

$$1,638\mathrm{.}09$