evidence: (a1/2) Whoever commits an assault and battery upon an elder or person with a disability shall be punished by imprisonment in the state prison for not more than 3 years or by imprisonment in a house of correction for not more than 21/2 years, or by a fine of not more than $1,000, or both such fine and imprisonment. (b) Whoever commits an assault and battery upon an elder or person with a disability and by such assault and battery causes bodily injury shall be punished by imprisonment in the state prison for not more than five years or in the house of correction for not more than two and one-half years or by a fine of not more than one thousand dollars or by both such fine and imprisonment. (c) Whoever commits an assault and battery upon an elder or person with a disability and by such assault and battery causes serious bodily injury shall be punished by imprisonment in the state prison for not more than ten years or in the house of correction for not more than two and one-half years or by a fine of not more than five thousand dollars or by both such fine and imprisonment.