(a) Except as provided in Section 4500, every person confined in the state prison of this state who commits an assault upon the person of another with a deadly weapon or instrument shall be guilty of a felony and shall be imprisoned in the state prison for two, four, or six years to be served consecutively.
(b) Except as provided in Section 4500, every person confined in the state prison of this state who commits an assault upon the person of another by any means of force likely to produce great bodily injury shall be guilty of a felony and shall be imprisoned in the state prison for two, four, or six years to be served consecutively.