Some $$database and application logging $$mechanisms $$track $$thenet $$change $$amount $$instead $$of $$the $$old $$and $$new $$values$.$For $$which $$of $$the $$following $$do $$the $$logging $$mechanisms $$not $$work$?$select $$all $$that $$apply $$

$-$

$$null $$values$,$numerica $$values$,$nonnumeric $$values$,$all $$of $$these