(b) In cases of treason the governor may grant reprieves until adjournment of the regular session of the legislature convening next after the conviction, at which session the legislature may grant a pardon or further reprieve; otherwise the sentence shall be executed.
(c) There may be created by law a parole and probation commission with power to supervise persons on probation and to grant paroles or conditional releases to persons under sentences for crime. The qualifications, method of selection and terms, not to exceed six years, of members of the commission shall be prescribed by law.