He was given <i><b>three months' remission</b></i> for good behaviour. (<a href='https://dictionary.cambridge.org/tr/s%C3%B6zl%C3%BCk/ingilizce/remission' target='_blank' rel='nofollow'>https://dictionary.cambridge.org/tr/s%C3%B6zl%C3%BCk/ingilizce/remission</a>) Are this versions of the remarked phrase above correct as well: <i><b>a three-month remission</b></i> <i><b>three-month remission</b></i>