Performance Period - The Base Year of this contract shall be 01 September 2015 - 31 August 2016. The Government may elect to exercise Option Years. Option Year 1 of this contract shall be 01 September 2016 - 31 August 2017. Option Year 2 of this contract shall be 01 September 2017 - 31 August 2018. Option Year 3 of this contract shall be 01 September 2018 - 31 August 2019. Option Year 4 of this contract shall be 01 September 2019 - 31 August 2020. Options Years are exercised solely at the discretion of the Government.