Which of the following methods require a variance

Methods that require a variance and a HACCP plan are:

Smoking of food as a method of preservation--but not if smoking is for flavor enhancement. Curing of food such as ham, sausages, etc. Using food additives to preserve food such as vinegar to render sushi rice so that it is not potentially hazardous.

Explanation:

d they all are treatable but they never completely go away