What is the minimum advance written notice a Massachusetts auto insurer must give an insured before non-renewing a private passenger auto policy under M.G.L. c. 175 §113F?

Why this is the answer

M.G.L. c. 175 §113F requires a Massachusetts auto insurer that does not intend to renew a policy in force 45 days before its termination date to give written notice of that intent on or before the 45th day, on a standard form prescribed by the commissioner. The notice goes to the Registry of Motor Vehicles and to the insured or the agent who wrote the policy, and it tells the insured that the residual market plan under §113H is available if voluntary coverage cannot be found.