Although there are seven different basic makeup methods for cookies, you must follow one important rule, regardless of which procedure you use. This rule is: $\_\_\_\_\_\_\_\_\_.$

a$.$

Make all cookies of uniform size and thickness.

b$.$

The sweeter the cookie, the shorter the baking time.

c$.$

All cookies in a single batch must be the same consistency.

d$.$

Cookie pans must be rotated half way through the baking process