Under Terms of the 2015 WTO, When Did Developed and Developing

Under terms of the 2015 WTO, when did developed and developing countries agree to eliminate agricultural export subsidies?

A) Both developed and developing countries agreed to immediately eliminate their agricultural export subsidies.
B) Developed countries agreed to immediately eliminate their agricultural export subsidies while developing countries were allowed to maintain their agricultural export subsidies.
C) Developed countries agreed to immediately eliminate their agricultural export subsidies while developing countries would have until the end of 2018 to eliminate their agricultural export subsidies.
D) Both developed and developing countries would have until the end of 2018 to eliminate their agricultural export subsidies.