Which statements is$($are$)$ generally true about appraisals in real estate?

Question $3$ options:

All appraisals must be reviewed by the State Department of Consumer Affairs

An appraisal may need to be revisited in a matters of months in a market that is under stress.

Appraisals must be conducted by the city or town assessor or an appraiser approved by the local municipality

They are estimates generally with an accuracy of a $5-10\%$

They are exact numbers because mortgage lenders require certainty before underwing a mortgage